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]: All of the planets in the solar system formed at about the same time from a large cloud of gas and dust. How is Earth different from other planets in the solar system?  
 (A) Earth has no natural satellites. (B) Earth's atmosphere is composed of gases. (C) Water is found in all three phases on Earth. (D) Volcanoes release liquid rock onto Earth's surface.
[EX A]: C

[EX Q]: Which would most likely be the characteristic of an object with a small volume and large mass?  
 (A) high density (B) low pressure (C) low viscosity (D) high temperature
[EX A]: A

[EX Q]: The relationships among elements were used to organize the elements systematically long before the behavior of electrons was understood. Which scientist is credited with this organization of elements?  
 (A) Democritus (B) John Dalton (C) Robert Millikan (D) Dmitri Mendeleev
[EX A]:
D