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]: One important use of coal is to produce energy for homes. Coal can be burned and converted to  
 (A) wind energy. (B) nuclear energy. (C) electrical energy. (D) solar energy.
[A]: C


[Q]: A biological community is made up of all the  
 (A) populations living in an area (B) natural resources present in an area (C) members of a species on Earth (D) environments on Earth
[A]: A


[Q]: Observation and measurement are important to scientific investigations because  
 (A) they are part of the instructions. (B) they are used to test a hypothesis. (C) they are required to make a hypothesis. (D) they keep you safe during an investigation.
[A]:
B