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").

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


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


[Q]: A person who is working on setting up power for their cottage will avoid (A) installing new power outlets (B) working on their wiring (C) installing electrical wires in walls (D) standing in a puddle
[A]:
D