when tadpoles need to swim immediately when there is a limited amount of water in their environment when there is a decrease in the number of predators when tadpoles need to blend in with their surroundings
I gave my students this multiple choice question: Under which circumstance would an adaptation that shortens the time of a tadpole's metamorphosis be most useful?

Only one answer is correct among these 4 choices:
- when tadpoles need to swim immediately
- when there is a limited amount of water in their environment
- when there is a decrease in the number of predators
- when tadpoles need to blend in with their surroundings

Could you tell me which one is correct?

when there is a limited amount of water in their environment