Task: Question Answering
Input (English): 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.
Output (English): A