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 adaptation helps a bird fly?  
 (A) larger feet (B) bigger eyes (C) longer beaks (D) hollow bones
[A]: D


[Q]: Energy appears in many forms. What form of energy is lightning?  
 (A) electrical energy (B) mechanical energy (C) magnetic energy (D) sound energy
[A]: A


[Q]: Some scientists have suggested that pandas may be more closely related to raccoons than to bears. What could scientists compare between pandas and the raccoons to help classify the panda more accurately?  
 (A) their diets (B) their DNA (C) their body sizes (D) their geographic distribution
[A]:
B