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]: If something is in an ecosystem, it could be (A) invisible (B) vacuum of space (C) lacking life (D) alien
[EX A]: C

[EX Q]: A stone may experience the most weathering over (A) a week (B) a year (C) a century (D) a decade
[EX A]: C

[EX Q]: When both a dominant and recessive gene are present, the dominate what will be visible? (A) society (B) feature (C) person (D) path
[EX A]:
B