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: A condition in bees called "colony collapse disorder" occurs when worker bees leave the hive to collect nectar and never return. How would a decline in the bee population most likely affect a farm ecosystem?  
 (A) There would be a decrease in soil thickness. (B) There would be a decline in fruit production. (C) There would be an increase in plant diseases. (D) There would be an increase in insect pest populations.
Example Output: B

Example Input: Organisms contribute to the water cycle mainly through the process of  
 (A) irrigation. (B) evaporation. (C) precipitation. (D) transpiration.
Example Output: D

Example Input: A light bulb manufacturer claims its light bulb is "twice as bright" per unit of electrical energy consumed as the leading light bulb. If this claim is correct, what factor must be accurately compared between the two bulbs?  
 (A) how much each bulb weighs (B) how long each bulb lasts (C) how much heat each bulb releases (D) how much metal each bulb contains
Example Output:
C