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.
--------
Question: A scientific guess about the cause and effect of an event is called  
 (A) a variable. (B) a theory. (C) a hypothesis. (D) an observation.

Answer: C


Question: The main function of a fish's fins is to help the fish  
 (A) reproduce (B) see (C) breathe (D) move

Answer: D


Question: Plastic conducts very little thermal energy or electricity. Because of this property, plastic would most likely be used to cover  
 (A) metal. (B) wood. (C) solids. (D) liquids.

Answer:
A