Given the task definition and input, reply with output. In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Question: Did the pop group that Foster was a keyboardist for have more than three members? Passage 1:In the first issue of Billboard of the year, Craig Wayne Boyd entered the Hot Country Songs chart at number one with "My Baby's Got a Smile on Her Face". Boyd, winner of season 7 of NBC's reality TV singing competition The Voice, was only the second artist in the chart's 57-year history to enter at number one. After holding the top spot for a single week, however, the song achieved the unusual feat of dropping off the chart entirely the following week. In addition to Boyd, one other artist was a first-time chart-topper on Hot Country Songs. Following a critically acclaimed performance at the 49th Country Music Association (CMA) Awards, Chris Stapleton's version of "Tennessee Whiskey", which had spent a single week at number 46 six months earlier, re-entered at number one, despite never having been officially released as a single or serviced to radio. Nine acts gained their first career country number ones by topping the airplay listing. Ashley Monroe made her first appearance at number one under her own name when she featured on Blake Shelton's hit "Lonely Tonight", although she had previously reached the top spot as part of the group Pistol Annies, who had been featured on another of Shelton's songs two years earlier. Between May and August, Tyler Farr, Kelsea Ballerini, Canaan Smith, Michael Ray, and the band A Thousand Horses were all first-time chart-toppers, as was Grace Potter, who was featured on veteran country star Kenny Chesney's song "Wild Child". Later in the year, the band Old Dominion and the duo Dan + Shay made their first appearances at number one.
 Passage 2:Foster was a keyboardist for the pop group Skylark, discovered by Eirik Wangberg. The band's song "Wildflower" was a top ten hit in 1973. When the band disbanded, Foster remained in Los Angeles and together with Jay Graydon he formed the band Airplay, whose album of the same name is often labeled as important within the west coast AOR genre. In 1975, he played on George Harrison's album Extra Texture. He followed that up by playing the Fender Rhodes and clavinet on Harrison's album Thirty Three & 1/3 a year later. In 1976 Foster joined Guthrie Thomas on Thomas' second Capitol Records album, Lies and Alibis, with Ringo Starr and a host of many other famed performers. Foster was a major contributor to the 1979 Earth, Wind and Fire album I Am, as a studio player and arranger, as well as being a co-writer on six of the album's tracks. The most noteworthy being the song "After the Love Has Gone", for which Foster and his co-writers, Graydon and Bill Champlin, won the 1980 Grammy Award for Best R&B Song.
 Passage 3:Hubble was born on 25 December 1900 to Harry Edward Hubble and Agnes Kate (née Field). He graduated from St Bartholomew's Hospital Medical College, qualifying with the Conjoint in 1924, and receiving the MBBS in 1926. He began his career as a general practitioner in Derby and joined Derbyshire Children's Hospital as a consultant in 1932, and obtaining the MD in 1934. He developed an interest in paediatric endocrinology, and gained a national reputation for his expertise after publishing numerous articles in the field. He worked simultaneously as a general practitioner and a specialist paediatrician until 1942, when he was appointed as a physician to the Derbyshire Royal Infirmary and Derby City Hospital. He resigned from general practice in 1948 following the formation of the National Health Service. In 1950 he gained membership of the Royal College of Physicians and became a Fellow of the Royal College of Physicians in 1954. He later joined the University of Birmingham Medical School in 1958 as the chair of paediatrics, and worked principally on the development of the Institute of Child Health. He became Public Orator of the university, and was later became dean of the Faculty of Medicine in 1963. He was forced to retire from Birmingham in 1968, 3 years beyond his retiring age, but moved to Ethiopia to become the dean of the Faculty of Medicine at Addis Ababa University.
2