Instructions: You are given a science question (hard-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: A class tested the amount of vitamin C in fresh orange juice and calculated a different amount than the previous class that conducted the same investigation. What should most likely be done to make sure that their results are accurate?
(A) try a different juice (B) analyze the recorded data (C) ask a scientist what went wrong (D) repeat the investigation two more times
Output:
D