Task: Text Completion
Input (English): Sentence1: Frank filled up dozens of water balloons to throw at this sister. Sentence2: Little did he know she was ready for him. Sentence3: When he started the attack, she pulled out a huge water gun. Sentence4: It was much more effective than his balloons. 
 (A) Frank enrolled in a marine biology class. (B) Frank bought a water gun the next day.
Output (English): A