instruction:
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:
Some birds fly south in the fall and return in the spring. This is an example of  
 (A) migration (B) camouflage (C) hibernation (D) growth
answer:
A


question:
Which process in the water cycle returns water from the surface of Earth to the atmosphere?  
 (A) condensation (B) evaporation (C) precipitation (D) runoff
answer:
B


question:
Why is a healthy diet important?  
 (A) It maintains a constant body temperature. (B) It prevents damage to internal organs. (C) It makes oxygen for all the cells in the body. (D) It supplies the body’s needs for growth and energy.
answer:

D