Detailed Instructions: 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.
Q: Question: What was the main evolutionary pressure? Passage 1:Truls Ove Karlsen (born 25 April 1975 in Oslo) is a retired Norwegian alpine skier. He made his Alpine Skiing World Cup debut in Sölden in 2001. He made a total of 143 World Cup starts, finishing third in a slalom in Sestriere in December 2002 and scoring his only World Cup win in a slalom in Kranjska Gora in February 2004, leading home team-mate Tom Stiansen in a Norwegian one-two ahead of Austrian Mario Matt. His best World Cup seasons were 2003 and 2004, where he finished eighth in the slalom standings. His best results at the Alpine Skiing World Championships were achieved at the 2007 Championships in Åre, where he finished sixth in the giant slalom and seventh in the slalom. He represented Norway at the 2010 Winter Olympics. Karlsen announced his retirement from competition in February 2013. Since then he has worked as a personal trainer. He graduated from the Norwegian University of Science and Technology with a bachelor's degree in History and Psychology in 2004, and started studies for a master's degree in law at the University of Oslo in 2013.
 Passage 2:In the 10th century, Abd al-Rahman al-Sufi (Azophi) carried out observations on the stars and described their positions, magnitudes, brightness, and colour and drawings for each constellation in his Book of Fixed Stars. He also gave the first descriptions and pictures of "A Little Cloud" now known as the Andromeda Galaxy. He mentions it as lying before the mouth of a Big Fish, an Arabic constellation. This "cloud" was apparently commonly known to the Isfahan astronomers, very probably before 905 AD. The first recorded mention of the Large Magellanic Cloud was also given by al-Sufi. In 1006, Ali ibn Ridwan observed SN 1006, the brightest supernova in recorded history, and left a detailed description of the temporary star.
 Passage 3:The time from roughly 15,000 to 5,000 BC was a time of transition, and swift and extensive environmental change, as the planet was moving from an Ice age, towards an interstadial (warm period). Sea levels rose dramatically (and are continuing to do so), land that was depressed by glaciers began lifting up again, forests and deserts expanded, and the climate gradually became more modern. In the process of warming up, the planet saw several "cold snaps" and "warm snaps", such as the Older Dryas and the Holocene climatic optimum, as well as heavier precipitation. In addition, the Pleistocene megafauna became extinct due to environmental and evolutionary pressures from the changing climate. This marked the end of the Quaternary extinction event, which was continued into the modern era by humans. The time around 11,700 years ago (9700 BC) is widely considered to be the end of the old age (Pleistocene, Paleolithic, Stone age, Wisconsin Ice Age), and the beginning of the modern world as we know it.

A:
3