TASK DEFINITION: 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.
PROBLEM: What season is the Northern Hemisphere experiencing when it is tilted away from the Sun?
(A) spring (B) summer (C) autumn (D) winter

SOLUTION: D

PROBLEM: Ella waves good-bye from the bus. What body system pulls on bones to let Ella wave her arm?
(A) muscular system (B) nervous system (C) digestive system (D) circulatory system

SOLUTION: A

PROBLEM: 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

SOLUTION:
C