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]: How do most fish get the oxygen they need to survive?  
 (A) They take in water and break it down into hydrogen and oxygen. (B) Using their gills, they take in oxygen that is dissolved in water. (C) They get their oxygen from the food they eat. (D) They come to the surface every few minutes to breathe air into their lungs.
[A]: B


[Q]: Which statement best describes the development of a human embryo?  
 (A) A single cell becomes many cells. (B) Each cell has a different function. (C) Many cells combine to form one cell. (D) All the cells have the same function.
[A]: A


[Q]: The house cat was believed to be tamed in ancient Egypt. In 2004, the remains of an eight-month old cat buried with its owner were discovered on the Mediterranean island of Cyprus. The date of burial, however, came before Egyptian civilization. Which best explains the importance of the discovery?  
 (A) Wildcats are not related to house cats. (B) Cats were domesticated earlier than originally thought. (C) Wildcats were not domesticated. (D) The period of Egyptian civilization was older than originally thought.
[A]:
B