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]: A scanning electron microscope is best suited for observing  
 (A) diffraction of light. (B) tectonic features on planets. (C) the surfaces of small objects. (D) topographical features on the ocean floor.
[A]: C


[Q]: Which statement describes all matter?  
 (A) All matter contains carbon. (B) All matter contains oxygen. (C) All matter is made up of cells. (D) All matter is made up of atoms.
[A]: D


[Q]: What is the most reasonable explanation for why a toy car rolls farther on a wood floor than on a thick carpet?  
 (A) The car weighs more on the carpet. (B) The car weighs more on the floor. (C) The carpet has more resistance. (D) The floor has more traction.
[A]:
C