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.

The energy that is stored in food originally comes from  
 (A) air (B) soil (C) sunlight (D) water
C

Which organ is made mostly of muscle?  
 (A) heart (B) lung (C) ear (D) brain
A

Which one of these animals does NOT lay eggs?  
 (A) chickens (B) dogs (C) frogs (D) turtles

B