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: An action that may provide a small bit of warmth could be (A) looking out of a window (B) putting the radio on (C) looking at a snow storm (D) smashing hands together repeatedly

SOLUTION: D

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

SOLUTION: D

PROBLEM: What is the effect of erosion on a river? (A) More Volume (B) unchanged (C) Dries up (D) Less Volume

SOLUTION:
A