Instructions: You are given a science question (hard-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: The waters off the Florida Keys are being polluted. This pollution affects the numerous marine ecosystems found in the Keys. Which action could most likely reduce water pollution?
(A) using compost as a fertilizer for lawns and gardens (B) using water from washing machines to water lawns (C) using cars that are designed to use petroleum products (D) using more plastic bottles and disposing them in landfills
Output:
A