You are given a science question (hard-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.

[EX Q]: A person cuts down a living oak tree. The person burns the wood from the oak tree to boil water. Which sequence correctly orders the energy transformations that occurred from the living tree to the boiling of water?  
 (A) light energy → chemical energy → thermal energy (B) thermal energy → chemical energy → light energy (C) chemical energy → mechanical energy → electrical energy (D) electrical energy → mechanical energy → chemical energy
[EX A]: A

[EX Q]: All planets of the solar system rotate, but not all planets have the same rotational velocity. Which characteristic of a planet is determined by the rotational velocity of the planet?  
 (A) the strength of the gravity (B) the shape of the orbit (C) the size of the planet (D) the length of the day
[EX A]: D

[EX Q]: Which of the following best explains the cause of windows rattling during a thunderstorm?  
 (A) electrical energy (B) sound energy (C) light energy (D) heat energy
[EX A]:
B