Definition: 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.
Input: What is one way people are helping the environment?
(A) They are planting trees to replace the ones that are cut. (B) They are building more roads so more people can see natural areas. (C) They are building more dumps to hold the trash we create. (D) They are using their cars more to get to places faster.
Output:
A