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 material best conducts heat and electricity?  
 (A) metal (B) plastic (C) rubber (D) wood
Example Output: A

Example Input: Which of these warms most of the air, water, and land on Earth?  
 (A) Coal (B) Electricity (C) Sunlight (D) Wind
Example Output: C

Example Input: A scientist looks at a graph that shows the percentages of humus, clay, and sand that make up a soil. If the scientist had the total weight of each material, instead of percentages, what type of graph would be best to illustrate the data?  
 (A) bar graph (B) scatterplot (C) circle graph (D) pictograph
Example Output:
A