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


[Q]: Which energy source is considered nonrenewable?  
 (A) moving water (B) fossil fuel (C) wind (D) biomass
[A]: B


[Q]: To a person standing motionless on the Earth's surface on a day with no wind, in which direction would the rain appear to fall?  
 (A) vertically (B) diagonally (C) horizontally (D) circularly
[A]:
A