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 property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature
Example Output: B

Example Input: Skunks spray a strong-smelling liquid to ___.  
 (A) get rid of wastes (B) attract prey (C) defend themselves (D) help nearby plants grow
Example Output: C

Example Input: Which is the best way to show the percent gas composition in Earth's atmosphere?  
 (A) bar graph (B) line graph (C) pie chart (D) scatterplot
Example Output:
C