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: Where do good bacteria grow to help keep people healthy?  
 (A) in the brain (B) in the blood (C) on the skin (D) on the bones
Example Output: C

Example Input: A student hypothesizes that algae are producers. Which question will best help the student determine if this is correct?  
 (A) Do algae consume other organisms? (B) Which organisms consume algae? (C) Do algae use sunlight to make food? (D) Could an ecosystem survive without algae?
Example Output: C

Example Input: A change in the pattern of warm ocean currents can cause a climate change by  
 (A) releasing thermal energy in irregular spurts. (B) absorbing thermal energy from the Sun's rays. (C) moving thermal energy from one place to another. (D) increasing the ocean's capacity for absorbing thermal energy.
Example Output:
C