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.
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Question: Which of these do all cells release?  
 (A) sugar (B) water (C) energy (D) oxygen

Answer: C


Question: The visible colors listed from shortest to longest wavelength are violet, blue, green, yellow, orange, and red. Which of the following accurately compares the frequency of these colors using this information?  
 (A) Blue has a higher frequency than violet. (B) Blue has a higher frequency than green. (C) Orange has a lower frequency than red. (D) Violet has a lower frequency than yellow.

Answer: B


Question: Which of the following is a chemical property of matter?  
 (A) density (B) boiling point (C) flammability (D) shape

Answer:
C