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.

[EX Q]: Which object works best when reflecting light?  
 (A) mirror (B) camera (C) binoculars (D) eyeglasses
[EX A]: A

[EX Q]: Which example would result in new cells that are most different from the parent cells?  
 (A) yeast cells splitting into new cells (B) bacteria cells dividing into new cells (C) skin cells dividing to produce more skin cells (D) sperm and egg cells uniting to produce fertilized egg cells
[EX A]: D

[EX Q]: Why is it not a safe practice to place a fuel depot over an aquifer?  
 (A) Aquifers are too high up in the mountains. (B) The weight of the depot is too great over the aquifer. (C) The fumes escaping from the fuel depot are explosive. (D) If the fuel leaks, the water in the aquifer will become contaminated.
[EX A]:
D