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 is an example of a form of electrical energy?  
 (A) lightning (B) windmill (C) radio waves (D) sound waves
Example Output: A

Example Input: A student measured liquid with a graduated cylinder. Which of the following units could be used to record the volume of the liquid?  
 (A) pounds (B) meters (C) grams (D) milliliters
Example Output: D

Example Input: Estuaries in Florida often have mangrove trees growing in them. The roots of the mangrove trees slow the flow of the water, which allows soil particles to settle. If people were allowed to remove the mangrove trees, how would the estuary environment most likely be affected?  
 (A) The amounts of nutrients in the water would decrease. (B) More habitats for fish would be established. (C) Populations of grasses would increase. (D) The risk of erosion would be reduced.
Example Output:
A