You will be given a definition of a task first, then some input of the task.
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.

Sentence1: Dave walked into the grocery store. Sentence2: He was going there to buy his favorite energy drink. Sentence3: He only had enough money to buy one can. Sentence4: He reached the aisle and what he saw made him smile. 
 (A) Dave bought an entire case. (B) They were on sale.
Output:
B