In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

If a fish lives in water that is very dark, the fish may calibrate its body over time to (A) absorb helium (B) turn invisible (C) eat more (D) be blind
D

As the pull of gravity decreases air molecules (A) explode (B) disperse (C) crowd together (D) party
B

On the list of a flower's goals would be to (A) produce carbon dioxide (B) deroot and die (C) produce offspring (D) remain sterile

C