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: Which group of organisms can make food by a process called chemosynthesis?  
 (A) scavengers (B) producers (C) consumers (D) decomposers
Example Output: B

Example Input: Wave energy from the ocean can be harnessed to power generators to make electricity. Energy from ocean tides can also be used to make electricity. How would you categorize these two sources of energy?  
 (A) Both are renewable. (B) Both are nonrenewable. (C) Wave energy is nonrenewable. Tidal energy is renewable. (D) Wave energy is renewable. Tidal energy is nonrenewable.
Example Output: A

Example Input: Mountain bike tires have large, knob-like treads. These tires are useful on steep slopes because they  
 (A) increase friction. (B) carry heavy weights. (C) increase the stopping distance. (D) prevent braking of the bicycle.
Example Output:
A