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]: A full moon is caused by (A) werewolves (B) moonlight (C) tides (D) orbiting
[A]: D


[Q]: In order for trees to use sunlight they must (A) their roots (B) the light switch (C) CPR (D) respire
[A]: D


[Q]: I just read about using cardboard in layers for building, but the surfaces should be waxed to keep out water.  This premise is used by some _____________ to keep water in: (A) balloons (B) plastic bottles (C) leaves (D) books
[A]:
C