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 party. Sentence 1: Kim threw a party one Saturday night. Sentence 2: She invited a boy she thought was cute. Sentence 3: She dressed to impress and did her hair. Sentence 4: At 7 PM, everyone started arriving. Choices: a. Dawn signed her first modeling contact today. b. The boy arrived with his girlfriend!

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
a