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 many groups were stationed at RAAF Station Pearce in August 1940 when Charlesworth was in command? Passage 1:Kean was born September 28, 1893, in Elberon, New Jersey. His father, Hamilton Fish Kean (18621941), was a United States Senator from New Jersey and his son, Thomas Kean, served two terms as the Governor of New Jersey. Robert Kean was the great-great-grandson of John Kean, a Delegate to the Continental Congress from South Carolina (17561795). His uncle, John Kean (18521914), was also a United States Senator from New Jersey. His grandson, Thomas Kean, Jr., is presently the Minority Leader of the New Jersey State Senate. His mother, Katherine Taylor Winthrop (18661943), was a descendant of John Winthrop, a wealthy English Puritan lawyer and one of the leading figures in the founding of the Massachusetts Bay Colony, the first major settlement in what is now New England after Plymouth Colony. Winthrop led the first large wave of migrants from England in 1630 and served as governor for 12 of the colony's first 20 years of existence. Kean is also a descendant of William Livingston, the first Governor of New Jersey.
Passage 2: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 Trndelag to Oslofjord being the other) were rendered obsolete in the 1970s.
Passage 3:As part of the RAAF's reorganisation following the outbreak of World War II in September 1939, No.2 Group was formed in Sydney on 20November; Charlesworth was appointed its Senior Air Staff Officer (SASO). He continued to serve in this position when the group was re-formed as Central Area in March 1940. Posted to Western Australia to take command of RAAF Station Pearce in August, he was promoted to temporary group captain on 1September 1940. He became Senior Administration Officer at the newly established Western Area, Perth, in January the following year. In September 1942, Charlesworth took over No.2 Bombing and Gunnery School in Sale, Victoria. He handed over to Group Captain Charles "Moth" Eaton in August 1943, before briefly taking charge of RAAF Headquarters Forward Echelon in Brisbane. Charlesworth was appointed Air Officer Commanding (AOC) Eastern Area, headquartered at Bradfield Park, Sydney, in December 1943. Eastern Area was responsible for maritime patrol and anti-submarine warfare off the coast of New South Wales and southern Queensland. Japanese submarine activity had decreased in the months prior to Charlesworth taking command, and he was concerned that Allied ships were becoming complacent. He observed "a general slackening off in procedure; ships are seldom where they should be, and a minority of merchant ships identify themselves to aircraft". The RAAF's patrols had also settled into a predictable pattern that would have been easy for an observant submarine captain to avoid.
3