Definition: 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: Due to the increasing average temperature of the atmosphere, polar ice sheets melt at a greater rate than they form. Which of these will be an effect of the continued melting of polar ice?
(A) A major reservoir of fresh water will decrease. (B) Plant life will increase due to higher sea levels. (C) Water runoff will cause an increase in ocean salinity. (D) Ocean temperature will decrease with the addition of cold water.
Output:
A