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").

[EX Q]: What displays the movement of electrons from the base atoms? (A) venus (B) mercury (C) plasma star (D) pluto
[EX A]: C

[EX Q]: Amphibians undergo changes in structure of being in that (A) salamanders can regrow their tails (B) salamanders can lose their tails (C) frogs can breathe air and water (D) they begin as a different looking being
[EX A]: D

[EX Q]: When birds migrate south for the winter, they do it because (A) they are genetically called to (B) their children ask for them to (C) it is important to their happiness (D) they decide to each year
[EX A]:
A