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]: An example of replacing a natural resource like copper might be (A) recovering ores (B) running around (C) throwing up (D) using plastic straws
[EX A]: A

[EX Q]: What contains nutrients for plants? (A) dirt cheap (B) wind (C) ground minerals (D) soiled clothes
[EX A]: C

[EX Q]: A pod of dolphins is swimming while searching for food. The youngest dolphin swims away from the pod and is lost. The rest of the pod searches for the young dolphin by clicking into the water. The young dolphin is found because of (A) echoes from noise (B) vibrations from drums (C) sound of water (D) movement in air
[EX A]:
A