Which of these sentences is the best restatement of the first sentence?

A. According to one survey in 1976 fewer than 3000 bald eagles were surviving in mainland USA

B. All the states apart from Alaska and Hawaii had less than 3000 bald eagles in 1976

C. Fewer than 3000 bald eagles were living in mainland USA, in the years up to 1976, one survey revealed.

D. In 1976 the lower 48 states of the USA had less than 3000 bald eagles, according to a mainland survey.