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 fish lives in water that is very dark, the fish may calibrate its body over time to (A) absorb helium (B) turn invisible (C) eat more (D) be blind

SOLUTION: D

PROBLEM: In a bowl of water with the sun shining on it, what happens to the water after four hours? (A) the water is growing algae (B) there is less water (C) the water is dirty (D) there is more water

SOLUTION: B

PROBLEM: When the demand for corn rises (A) farmers grow different crops (B) farmers ask people to stop eating corn (C) farmers stop planting corn (D) farmers must harvest more corn

SOLUTION:
D