Given the task definition and input, reply with output. 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 does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Title: The Book Sale. Sentence 1: Esmae loved reading books. Sentence 2: One day the library had a book sale with all the classics. Sentence 3: Esmae reluctantly borrowed $20 from her mother to go to the sale. Sentence 4: She came home with a huge stack of wonderful books. Choices: a. Lance lost his dog. b. Now Esmae happily does extra chores to pay back her mother.
a