You will be given a definition of a task first, then some input of the task.
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 long did the time period last in which a huge ice shelf melted between 11,000 and 8,000 BC? Passage 1:It was the 12th New Zealand Grand Prix, doubled as the opening round of the 1965 Tasman Series. The race attracted 19 starters, including several overseas based drivers and teams. A large contingent of cars from Australia competed, including Frank Gardner competing for Alec Mildren Racing. Lex Davison and Leo Geoghegan brought across their own teams, while 1962 Formula One world champion, British racer Graham Hill race a Brabham for David McKay's Scuderia Veloce team. Star attraction though was the appearance of Team Lotus with their lead driver, 1963 World Champion, Jim Clark. Local honour was upheld by Bruce McLaren, who in an early iteration of the later McLaren team brought a pair of factory supported Coopers to race with American racer, the 1961 World Champion Phil Hill as his number two. The race was won by Graham Hill, his first victory in the NZGP. Gardner finished second to be the first 'antipodean' while first New Zealander was domestic series racer Jim Palmer in a career highlight as Brabham racing cars clean swept the podium.
 Passage 2:Iris Chang was the daughter of two university professors, Ying-Ying Chang and Dr. Shau-Jin Chang, who emigrated from Taiwan to the United States. Chang was born in Princeton, New Jersey and raised in Champaign-Urbana, Illinois. Chang grew up hearing stories about the Nanking massacre, from which her maternal grandparents managed to escape. When she tried finding books about the subject in Champaign Public Library, she found there were none. She attended University Laboratory High School of Urbana, Illinois and graduated in 1985. She was initially a computer science major, but would later switch to journalism, earning a bachelor's degree at the University of Illinois at Urbana-Champaign in 1989. During her time in college she also worked as a New York Times stringer from Urbana-Champaign, and wrote six front-page articles over the course of one year. After brief stints at the Associated Press and the Chicago Tribune, she pursued a master's degree in Writing Seminars at Johns Hopkins University. She then embarked on her career as an author and lectured and wrote magazine articles. She married Bretton Lee Douglas, a design engineer for Cisco Systems, whom she had met in college, and had one son, Christopher, who was 2 years old at the time of her suicide. She lived in San Jose, California in the final years of her life.
 Passage 3:The first inhabitants were the Ahrensburg culture (11th to 10th millennia BC), which was a late Upper Paleolithic culture during the Younger Dryas, the last period of cold at the end of the Weichselian glaciation. The culture is named after the village of Ahrensburg, north-east of Hamburg in the German state of Schleswig-Holstein, where wooden arrow shafts and clubs have been excavated. The earliest traces of human occupation in Norway are found along the coast, where the huge ice shelf of the last ice age first melted between 11,000 and 8,000 BC. The oldest finds are stone tools dating from 9,500 to 6,000 BC, discovered in Finnmark (Komsa culture) in the north and Rogaland (Fosna culture) in the south-west. However, theories about two altogether different cultures (the Komsa culture north of the Arctic Circle being one and the Fosna culture from Trøndelag to Oslofjord being the other) were rendered obsolete in the 1970s.

Output:
3