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: The Swimming Pool. Sentence 1: Vincent was a lifeguard at his neighborhood pool. Sentence 2: He saw a child running around the pool. Sentence 3: He asked the child to stop running, but the child ignored him. Sentence 4: The child fell and started crying. Choices: a. Andy was so glad he had the opportunity to see the Indian celebration. b. Vincent laughed at the child.
b