TASK DEFINITION: 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").
PROBLEM: Someday, the ground under the pile of rotting grain in the field will be (A) barren (B) a hole (C) more fertile (D) less fertile

SOLUTION: C

PROBLEM: 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

SOLUTION: C

PROBLEM: What is pulling your finger over a guitar string an example of? (A) tightening a guitar string (B) Stopping a musical sound (C) making music with an instrument (D) Putting a guitar away

SOLUTION:
C