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.

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

[EX Q]: Which animal eats only plants?  
 (A) Cat (B) Dog (C) Lion (D) Rabbit
[EX A]: D

[EX Q]: Which tools are used to determine the boiling point of water?  
 (A) hot plate and stopwatch (B) thermometer and balance (C) hot plate and thermometer (D) balance and graduated cylinder
[EX A]:
C