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.

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

In a northern state, a room used for growing plants is not allowing enough light to enter for healthy plant growth. Adding windows in walls facing which direction would best solve this problem?  
 (A) north (B) south (C) east (D) west
B

During winter, the white fur of an arctic fox blends in with the snow. This adaptation is called  
 (A) hibernation (B) migration (C) camouflage (D) movement

C