Q: 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.
The freezing and thawing action of water affects a rock by
(A) transforming the rock into igneous rock. (B) chemically changing the rock. (C) gradually breaking down the rock into smaller pieces. (D) leaving behind sedimentary particles from evaporated solutions.
A:
C