
Passage: Among the pilots who joined the state-run airlines more than a decade ago, those who later transferred to private airlines now usually earn more than one million yuan a year, while those who remain in state-run airlines generally earn no more than 600000 yuan a year. These figures show that pilots at state-run airlines are underpaid.
Question: Which of the following options is the hypothesis required by the above conclusion?
A. A.The vast majority of pilots transferred to private airlines think that the pay of state-owned airlines is too low.
B. B.Pilots who are transferred to private airlines are generally more senior and more capable of working.
C. C.If the pilots who still stay in the state-run airlines also choose to go to private airlines, their annual salary will be more than 1 million yuan.
D. D.The annual mileage flown by pilots of private airlines and pilots of state-run airlines is roughly the same.
Answer: