In this task, you're given four sentences of a story written in natural language. The given story is not complete and your job is to complete the story by selecting one of the sentence choices from (A) and (B), such that the story sounds fully coherent.
Q: Sentence1: Pat has a math test coming up. Sentence2: He studies very hard for a week. Sentence3: Pat makes flashcards to read on the bus. Sentence4: Pat aces his test. 
 (A) Pat is happy. (B) Pat is sad.
A: 
A