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]: As water cools to a temperature of zero degrees Celsius and forms ice, water molecules tend to  
 (A) move farther apart. (B) vibrate rapidly. (C) flow more randomly. (D) gradually expand.
[EX A]: A

[EX Q]: Which is the best evidence for the theory of continental drift?  
 (A) the appearance of volcanoes at the boundaries where plates collide (B) earthquakes at boundaries where one plate slides past another (C) cases where a species exists in only one isolated place (D) fossils of the same species found on widely separated continents
[EX A]: D

[EX Q]: Which of the following groups of materials would most likely be used to build an electromagnet?  
 (A) bare wire, plastic rod, battery (B) bare wire, iron rod, light bulb (C) insulated wire, iron rod, battery (D) insulated wire, plastic rod, light bulb
[EX A]:
C