Instructions: In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.
Input: Title: The Library Books. Sentence 1: Angel was going to the library. Sentence 2: When she got there she realized she forgot to bring her books. Sentence 3: Angel went home and got her library books. Sentence 4: She returned the books to the library. Choices: a. Angel checked out three new books. b. Her lips got all messed up unfortunately.
Output:
a