Task: Question Answering
Input (English): Clouds are formed from tiny drops of water that are light enough to float in the air. As these drops bump into each other, they form larger drops. What happens when these drops become too heavy to float in the air?  
 (A) The drops form fog. (B) The drops evaporate. (C) The drops fall as rain. (D) The drops become air.
Output (English): C