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: How wide is the body of water that separates the Eurasian and North American continents? Passage 1:After receiving his degree from Eastman, Canning taught music theory and composition at Morningside College (1936–1941) and Indiana University of Pennsylvania (1945–1946). In 1946, he took a position with The Royal Conservatory of Music at the University of Toronto, teaching music theory in the RCM's newly created MBac program for training secondary and elementary school music teachers. Canning was appointed Assistant Professor of Theory at Eastman in 1947 and taught there until 1961, when he left for a year to serve at the University of Hull as a Fulbright professor. In 1963 Canning was hired as an associate professor at the newly opened Creative Arts Center at West Virginia University, receiving promotion to full professor in 1967, retiring in 1977. Canning belonged to the American Composers Alliance, The Hymn Society of America, and Pi Kappa Lambda, and was an honorary member of Phi Mu Alpha Sinfonia.
 Passage 2:The route is described in a series of six sectional leaflets, updated in 2008, which are available from Burnley Tourist Information Centre. The first section begins at the Manchester Road canal bridge (where the Weavers' Triangle Visitor Centre is located), and follows the towpath of the Leeds and Liverpool Canal over the Burnley Embankment to Thompson Park. It then follows the River Brun through Bank Hall Park and past Heasandford House where it joins the route of the Brontë Way out of Burnley, almost to Lea Green Reservoir. It then passes the ruined Extwistle Hall and over the River Don to Queen Street Mill Textile Museum in Harle Syke. The second section crosses Todmorden Road, passing a number of farms and over Thursden brook. It then follows the road up the Thursden valley and crosses into West Yorkshire, descending to Widdop Reservoir. Joining the Mary Towneley Loop section of the Pennine Bridleway at the Gorpe track, it moves back into Lancashire and past Hurstwood Reservoir to the Elizabethan hamlet of Hurstwood.
 Passage 3:The Russian Empire began its interest of the Pacific Northwest in the 18th century, initially curious if there was a land connection between the Eurasian and North American Continents. Two expeditions were led by Vitus Bering, with the findings proving the separation of two continents through the Bering Sea. Being the first European nation to chart much of what comprises the modern American state of Alaska, many locations retain Russian place names. The discovery of sizable fur bearing populations by Bering drew the attention of promyshlenniki previously engaged in the Siberian fur trade. Based out of the Siberian ports of Okhotsk or Petropavlovsk, fur trappers sailed and reported the location of land formations like the Aleutian Islands, Kodiak Island and portions of the Alaskan mainland. Relations with Native Alaskans was often terse due to the uncontrolled actions of particular promyshlenniki who killed and raped Indigenous on islands they trapped furs.
3