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: 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: Air is composed of many different substances. Which of the following components of air is a compound rather than an element?  
 (A) Argon, Ar (B) Oxygen, O2 (C) Water, H2O (D) Nitrogen, N2

Answer: C


Question: Why is the particular sequence of bases in a segment of DNA important to cells?  
 (A) Some base sequences code for protein production. (B) Some base sequences cause the release of lipids from the nucleus. (C) Some base sequences contain the order of sugars in polysaccharides. (D) Some base sequences produce electrical signals sent to the cytoplasm.

Answer:
A