Definition: 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.
Input: Why is it important to repeat an experiment several times?
(A) to use up all the materials (B) to give all the students the chance to participate (C) to collect more data to fit the hypothesis (D) to determine if the results are similar
Output:
D