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: Which lists the diameter of the planets in order from smallest to largest?  
 (A) Venus, Earth, Mercury, Mars (B) Earth, Mars, Venus, Mercury (C) Mars, Mercury, Earth, Venus (D) Mercury, Mars, Venus, Earth

Answer: D


Question: Which particle type can be identified as being from a specific element?  
 (A) electron (B) atom (C) neutron (D) proton

Answer: B


Question: Each year the Earth moves once around  
 (A) Mars (B) the Sun (C) the Moon (D) all the other planets

Answer:
B