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: Long shore currents are ocean waves that strike beaches at extremely small angles. In areas where long shore currents exist, what effect do they have on land areas?
(A) They build mountains. (B) They cause earthquakes. (C) They move sand, creating sandbars. (D) They create inland saltwater rivers.
Output:
C