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: Which of the countries where Commelina hockii can possibly be found has the largest population? Passage 1:Commelina hockii is an herbaceous plant in the dayflower family found primarily in Central Africa, from southwestern Tanzania in the east, west through the Democratic Republic of the Congo and Zambia, and possibly extending further west to Angola. The species' distinctive features include its long, tapering spathes with unfused margins, its white flowers, and its many-flowered lower cymes. It can be found in grasslands and Brachystegia-dominated woodland. It is fairly unusual among Commelina species in having variation in the color of the antherodes (i.e. non-functional anthers), with some individuals having entirely yellow antherodes, while others contain a dark spot in the center. Also, it is one of the only Commelina species known to leave a papery residue of dried fluid inside its spathes; normally only fused-spathe species are known to produce this substance. Only one specimen from Angola resembles this species, but it has blue flowers, suggesting it may be a poorly understood and as-yet undescribed separate species. Commelina hockii is probably closely related to Commelina kituloensis, which shares a similar fruit type, the same tufted perennial habit, similar large spathes with dried fluid substance, and equally numerously flowered inflorescences. That species differs in having purplish flowers, hairy leaves, shorter spathes, and a preference for high altitude grassland.
Passage 2:Knight joined Portsmouth F.C. as an apprentice at the age of 14 and signed a professional contract with the club in 1977. He went on to make his debut for the club a year later, keeping a clean sheet in a 20 Football League Third Division win against Rotherham United with Portsmouth's relegation to the fourth tier of English football already confirmed. Knight served as reserve goalkeeper to Peter Mellor for the next three seasons, making eight appearances during Pompey's 197980 promotion season, before establishing himself as the team's first choice goalkeeper during the 198182 season where he was named the fans' player of the season for the first time. Knight was a member of the team that won the Third Division championship in 198283 and was given a debut for the England U21 team in a 1984 UEFA European Under-21 Championship qualifier against Greece at Portsmouth's ground Fratton Park. He made one further appearance for the England U21s against Hungary, before first choice goalkeeper Gary Bailey returned from injury. England went on to win the final tournament, with Knight's Portsmouth teammate Mark Hateley named player of the tournament.
Passage 3:Romer was appointed a judge of the Chancery Division of the High Court in 1922, in succession to Sir Arthur Frederick Peterson, and received the customary knighthood the same year. In 1929, he was made a Lord Justice of Appeal and sworn of the Privy Council. On 5 January 1938, he was appointed Lord of Appeal in Ordinary in succession to Lord Roche and was made a life peer with the title Baron Romer, of New Romney in the County of Kent. He resigned as Lord of Appeal in April 1944, and died four months later. His son, Sir Charles Romer, was appointed to the Chancery Division two months after his death, following in the steps of both his father and grandfather.
1