You are given a science question (hard-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.
--------
Question: What unit of measurement would be used to describe the melting point of a substance?
(A) liters (B) grams (C) degrees (D) centimeters

Answer: C

Question: Which of these most likely determines if a mutation will become an adaptation in a species?
(A) genetic variation (B) mitosis (C) natural selection (D) succession

Answer: C

Question: Many natural resources are found in Maryland and the surrounding area. Some of these natural resources are renewable and some are nonrenewable. People use both kinds of resources in daily activities. Using natural resources often produces waste products. Recycling centers are where people take materials that may be reused to make new products. How does recycling paper positively affect the environment?
(A) reduces air pollution (B) increases soil erosion (C) reduces trees that are cut (D) increases habitat destruction

Answer:
C