Given the task definition and input, reply with output. 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.

Having students wash their hands frequently with soap and water will limit the spread of infectious disease by
(A) protecting harmless bacterial cells. (B) changing viral and bacterial nucleic acids. (C) releasing mutated cells from pores. (D) removing viruses and bacteria from the skin.
D