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.
Q: How do the waxy stem covering and needle-shaped leaves improve the ability of a cactus to survive in the desert?
(A) They make the plant appetizing to small desert animals. (B) They prevent the loss of oxygen through photosynthesis. (C) They reduce the loss of water from the plant to the air. (D) They provide the storage space for different types of minerals.
A:
C