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: the mantle is (A) a level of our planet (B) the planet closest to ours (C) a kind of rock found on Earth (D) the deepest part of our planet

SOLUTION: A

PROBLEM: It is possible to renew (A) sunflowers (B) oil (C) steel (D) stones

SOLUTION: A

PROBLEM: An amoeba is a unique individual that (A) makes friends (B) has multiple uses (C) works together (D) exists solitary

SOLUTION:
D