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: if a chemical reaction occurs, it might have been triggered by which of these? (A) a person yelling at it (B) a person walking by it (C) a person looking at it intently (D) a person cranking up the room heater

SOLUTION: D

PROBLEM: How does erosion impact a river? (A) enlargening (B) warming (C) heightening (D) shrinking

SOLUTION: A

PROBLEM: As I search among classifications, its groupings of materials, and properties, I may be looking for (A) hydrogen peroxide (B) aspirin (C) vitamins (D) petroleum jelly.

SOLUTION:
C