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").

An example of conservation is (A) jogging (B) reducing ethanol use (C) hiking (D) raking leaves
B

Rocket engines can lift rockets because (A) of how much fuel they use (B) of how fast they are (C) of the power the hit the ground with (D) of how tall they are
C

Skin can protect your (A) emotions (B) anger (C) feelings (D) squishy bits

D