You will be given a definition of a task first, then some input of the task.
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.

Which best describes why winds at the beach change direction between day and night?
(A) because the temperatures over land and over water change (B) because warm air over land sinks and stays in place over land (C) because cool air rises and is replaced by warm air from the ocean (D) because cool air sinks and stays in place over land
Output:
A