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Question: 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.

B is a correct answer but I have no idea why C is not a correct one. Please explain it for me. Thank you!

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Minh Anh NguyễnB is a correct answer

They are testing to see if you know the simple formula

unless = if ... not.

CJ

Comments  
Minh Anh Nguyễn Question: Unless this biodiversity were maintained, marine life would be at stake.

This is ungrammatical and skewed. There is no call for the subjunctive, and conditionality is implicit in "unless". Also, "at stake" requires a gamble. They meant "at risk". It should be "Unless this biodiversity is maintained, marine life will be at risk."

But, supposing we know what they thought it meant …

Minh Anh NguyễnB is a correct answer but I have no idea why C is not a correct one.

You don't want a correct answer. You want the best answer. Sentence B is the straightforward equivalent of the corrected sample sentence. Sentence C ignores the possibility that some other factor besides biodiversity could put marine life at risk.

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