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]: Rock layers with sand-sized particles were most likely deposited by  
 (A) wind. (B) water. (C) glaciers. (D) landslides.
[A]: A


[Q]: The nucleus of MOST atoms consists of  
 (A) neutrons only (B) protons and neutrons (C) protons and electrons (D) neutrons and electrons
[A]: B


[Q]: Many people like to use microwave ovens rather than traditional ovens. The main reason for this is that microwave ovens  
 (A) take less time to cook food than regular ovens do. (B) get hotter than regular ovens. (C) do not leave spattered grease or food on the inside. (D) cannot overcook food.
[A]:
A