You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Input: Consider Input: While conducting an experiment on gravity, what will be needed to ensure the safety of students?
(A) quiet zones (B) drop zones (C) heavy objects (D) frictionless surfaces

Output: B

Input: Consider Input: Which location on Earth receives the most direct sunlight?
(A) the deserts (B) the South Pole (C) the equator (D) the Western Hemisphere

Output: C

Input: Consider Input: A pond is near river but not connected to it. What would most likely allow fish to move from the pond to the river?
(A) a fire (B) a drought (C) a snowstorm (D) a flood
Output: D