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]: Obstacles that might impede a dune are (A) God (B) emotions (C) cacti (D) cancers
[EX A]: C

[EX Q]: What is it called when a cell converts oxygen and carbohydrates into carbon dioxide, water, and energy? (A) adaptation (B) breathing (C) food transformation (D) catabolic reactions
[EX A]: D

[EX Q]: Due to the wobble of the earth it has four different (A) visitors (B) locations (C) time zones (D) seasons
[EX A]:
D