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:
The ounce, the pound, and the ton are units of  
 (A) time. (B) weight. (C) length. (D) distance.
answer:
B


question:
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
answer:
C


question:
Fossils of sea animals were found in a cave in Arkansas. What does this mean about that area of Arkansas in the past?  
 (A) It was once underwater. (B) It was once much warmer. (C) It has become a rockier place. (D) It has changed little from then.
answer:

A