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.
--------
Question: Which is the best piece of equipment to determine the topography of the United States?  
 (A) radar (B) compass (C) satellite (D) radio

Answer: C


Question: A brand of fertilizer claims that it contains all the chemicals a plant needs for rapid growth. It may be inferred that the fertilizer includes all these ingredients except  
 (A) potassium. (B) phosphorus. (C) carbohydrates. (D) nitrogen.

Answer: C


Question: In addition to oxygen, what do plants produce during photosynthesis?  
 (A) chlorophyll (B) sugar (C) carbon dioxide (D) light energy

Answer:
B