TASK DEFINITION: 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.
PROBLEM: Which of these will most likely harm a habitat?  
 (A) planting trees (B) water pollution (C) rainfall (D) sunlight

SOLUTION: B

PROBLEM: Which is an example of a form of electrical energy?  
 (A) lightning (B) windmill (C) radio waves (D) sound waves

SOLUTION: A

PROBLEM: Scientists found evidence of past glacial activity in Massachusetts. Which of the following conclusions is best supported by this evidence?  
 (A) Sea levels were much higher in the past. (B) The climate on Earth has changed over time. (C) Total numbers of organisms on Earth have changed over time. (D) The total amount of radiation from the Sun was much higher in the past.

SOLUTION:
B