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: A light-year is a measure of
(A) time. (B) energy. (C) distance. (D) direction.

SOLUTION: C

PROBLEM: Diamonds are sometimes used as the tips of drill bits. Which physical property of a diamond MOST likely makes it a good cutting tool?
(A) its electrical properties (B) its thermal properties (C) its hardness (D) its density

SOLUTION: C

PROBLEM: Which of the following laboratory practices should be avoided?
(A) pouring water into an acid (B) pouring a base into water (C) pouring water into alcohol (D) pouring alcohol into a base

SOLUTION:
A