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 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.

Title: What do Cats have to do with it?. Sentence 1: Sharon was always being told the curiosity killed the cat. Sentence 2: As she didn't understand this she asked so many questions about it. Sentence 3: She asked questions about everything. Sentence 4: She asked questions about the answers she was given. Choices: a. One day she received an encyclopedia, and never had to ask again. b. He doesn't eat tofu anymore.
a