Task: Question Answering
Input (English): When you are riding a bicycle at night, your bicycle's reflectors help people in cars see your bicycle. How do bicycle reflectors work?  
 (A) They are made of a special material that gives off its own light. (B) They are hooked up to batteries that allow them to produce light. (C) They bounce light back from other sources. (D) They are covered with paint that glows in the dark.
Output (English): C