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.

Melinda looked out of her window one night and saw a very bright star just over the top of a tree. Late that night she looked out and the star was gone. Which BEST explains what happened?
(A) Earth turns so the stars seem to move. (B) Some stars only shine for a few hours each night. (C) The star must have burned up. (D) Some stars move faster than others.
A