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 purpose of thorns on a plant is most likely to  
 (A) help the plant to get moisture. (B) anchor the plant in the ground. (C) protect the plant from harm. (D) support the stems and branches.
C