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: Sam looks into a fish pond and points at a goldfish. Sam's grandfather looks where Sam is pointing and tells Sam that the fish is actually in a different location. Which property of light explains why Sam's grandfather is correct?
(A) reflection (B) refraction (C) diffraction (D) absorption
Example Output: B

Example Input: Which is the greatest benefit of sexual reproduction?
(A) capable of reproducing by meiosis (B) ability to reproduce without a mate (C) ability to produce genetically different offspring (D) capable of producing offspring genetically identical to parent
Example Output: C

Example Input: Two species of garter snake in the genus Thamnophis originated from a single ancestor. These two species live in the same geographic area, however, one lives in arid land and the other lives in water.Which of the following best identifies the cause of speciation between these two garter snakes?
(A) mechanical isolation (B) behavioral isolation (C) habitat isolation (D) allopatric isolation
Example Output:
C