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]: Which is the best tool for measuring the temperature of lake water?  
 (A) Meter stick (B) Balance (C) Graduated cylinder (D) Thermometer
[A]: D


[Q]: During which season of the year would a rabbit's fur be thickest?  
 (A) fall (B) spring (C) summer (D) winter
[A]: D


[Q]: Which sea otter behavior is learned?  
 (A) using fur to trap air for warmth (B) cracking open clams with a rock (C) nursing its young for six months (D) closing its ears under water
[A]:
B