Unless this biodiversity were maintained, mari...

Câu hỏi: Unless this biodiversity were maintained, marine life would be at stake.

A If this biodiversity were maintained, marine life would be at stake.

B If this biodiversity weren’t maintained, marine life would be at stake.

C If this biodiversity were maintained, marine life wouldn’t be at stake

D If this biodiversity weren’t maintained, marine life wouldn’t be at stake.