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.
Q: Title: A Day at the Zoo. Sentence 1: Jimmy's first grade class went to the zoo on a field trip. Sentence 2: There was so much to see! Sentence 3: Jimmy's favorite exhibit was the otters. Sentence 4: They were playing and splashing around like crazy. Choices: a. My mother never know about it. b. He couldn't wait to visit the zoo again.
A:
b