According to the passage, the frozen ice on the se...

Câu hỏi: According to the passage, the frozen ice on the sea surface was dangerous to whales because ______.

A. they couldn’t swim in tiny cold water.

B. they couldn’t eat when the weather was too cold.

C. whales couldn’t breathe without sufficient oxygen.

D. the water was too cold for them as they were warm-blooded.