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]: The changing appearances of the nighttime sky over the surface of Earth and eclipses of the Moon have provided evidence that  
 (A) Earth is a sphere. (B) Earth supports life. (C) Earth has a layered atmosphere. (D) Earth is covered mostly with water.
[A]: A


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


[Q]: A telescope would be most useful in answering which question?  
 (A) How do rockets move in space? (B) What shape is a human skin cell? (C) What is on the surface of the Moon? (D) How do worms breathe underground?
[A]:
C