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.

[Q]: In which state are molecules of a substance arranged in the most orderly way?  
 (A) gas (B) liquid (C) plasma (D) solid
[A]: D


[Q]: If the solar system were used as a model of an atom, what would the Sun most likely represent?  
 (A) an ion (B) a nucleus (C) a neutron (D) an electron
[A]: B


[Q]: Beryl finds a rock and wants to know what kind it is. Which piece of information about the rock will best help her to identify it?  
 (A) The size of the rock (B) The weight of the rock (C) The temperature where the rock was found (D) The minerals the rock contains
[A]:
D