Definition: 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.
Input: Sentence1: Noah bought an old book at the thrift store. Sentence2: He took it home and began to read it. Sentence3: As he did, something fell out of the pages. Sentence4: Noah bent curiously and picked it up, eyes widening. 
 (A) He went back to reading his book. (B) What had been pressed between the pages was a four-leafed clover!
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
B