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.

[Q]: 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.
[A]: C


[Q]: Four students tried to find out which magnet was the strongest. They each shared one idea. Which idea shows scientific thinking?  
 (A) We can pick the longest magnet. (B) We can pick the heaviest magnet. (C) We can measure the strength of the magnets. (D) We can vote for the magnet that we think is the strongest.
[A]: C


[Q]: How do producers get energy?  
 (A) eating plants and seeds (B) eating other animals (C) breaking down organisms through decay (D) using the sun to make food
[A]:
D