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

[Q]: This can be used to light up a light bulb (A) grass (B) dirt (C) stones. (D) biofuel
[A]: D

[Q]: Plants can use what as a pollinator? (A) bees wax (B) small extinct birds (C) rhinos (D) windy air
[A]:
D