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: Chased across the Street. Sentence 1: Dan's father walked with him and his friends across the neighborhood. Sentence 2: It was Halloween and they were looking for candy. Sentence 3: A man in a Scream costume suddenly ran towards them. Sentence 4: They chased everyone across another street. Choices: a. But his doubts disappeared when he saw his child for the first time. b. Once Dan dropped his candy, the man took it and ran away.
b