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: Which sustains life yet stopped growing? (A) air (B) a bush (C) a rock (D) a felled tree

SOLUTION: D

PROBLEM: animals learn some behaviors from watching their (A) rocks (B) toys (C) caretakers (D) trees

SOLUTION: C

PROBLEM: if a solid piece stands out in the elements, and reduces in size over time, what might have happened? (A) it is moving away (B) it has been depressed (C) it has been stolen (D) it has been weathered down

SOLUTION:
D