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.
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Question: The Piedmont and Coastal Plains regions in Maryland produce crops such as corn, soybeans, wheat, tobacco, tomatoes, and apples. Which environmental factor most likely influences which crops are grown in these regions?
(A) soil quality (B) wind speeds (C) bird migration (D) water temperature

Answer: A

Question: Which of these elements is found in the greatest amount in organisms?
(A) carbon (B) iron (C) lead (D) neon

Answer: A

Question: Natural selection is a mechanism that acts on individuals within a population. Which is a result of the process of natural selection?
(A) The reproductive rate of the population decreases. (B) Genetic similarity within the population increases. (C) Organisms are better adapted to their environment. (D) Adverse changes to the environment become more frequent.

Answer:
C