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:
Melting, boiling, and freezing are examples of  
 (A) physical changes. (B) chemical changes. (C) magnetic changes. (D) electrical changes.
answer:
A


question:
Which of these warms most of the air, water, and land on Earth?  
 (A) Coal (B) Electricity (C) Sunlight (D) Wind
answer:
C


question:
A student states that plants grow taller when grown in natural light than they do in artificial light. Which method is the best way to determine if the statement is fact or opinion?  
 (A) conduct a controlled experiment (B) discuss the statement with other students (C) ask several teachers their thoughts (D) propose a scientific conclusion
answer:

A