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.

Example Input: The number of fish in a lake suddenly increases. How will the increase most likely affect the lake?
(A) There will be less water in the lake. (B) More plants will grow in the lake. (C) More frogs will live in the lake. (D) There will be fewer insects in the lake.
Example Output: D

Example Input: Which correctly arranges three scientific terms-theory, law, and hypothesis-from least to most accepted or tested?
(A) theory, hypothesis, law (B) hypothesis, law, theory (C) theory, law, hypothesis (D) hypothesis, theory, law
Example Output: D

Example Input: According to the fossil record, when did episodes of rapid speciation commonly take place?
(A) while Earth's continents were joined (B) while Earth's habitats were stable (C) before major climatic changes (D) following mass extinctions
Example Output:
D