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.

Ex Input:
About how long is a lunar cycle?  
 (A) 1 day (B) 1 week (C) 28 days (D) 52 weeks

Ex Output:
C


Ex Input:
Humans use both renewable and nonrenewable resources. Which human activity uses a nonrenewable resource?  
 (A) building houses with wood (B) using natural gas to heat homes (C) using solar energy to power lights (D) producing electricity from flowing water

Ex Output:
B


Ex Input:
The stages in the life cycle of an organism are shown below. birth -> growth -> development -> reproduction -> death In which life cycle stage will a new organism be made?  
 (A) growth (B) development (C) reproduction (D) death

Ex Output:

C