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]: To which group does an animal belong if it lays eggs and has scales and gills?  
 (A) amphibian (B) bird (C) fish (D) reptile
[A]: C


[Q]: A light year is used to measure  
 (A) time. (B) distance. (C) luminosity. (D) temperature.
[A]: B


[Q]: When a person chews, saliva from the mouth mixes with starches in food. These starches begin to turn into sugars. Changing starches into sugars is best described as  
 (A) a phase change. (B) a cellular change. (C) a physical change. (D) a chemical change.
[A]:
D