Detailed Instructions: 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.
Q: Title: Proposal after the break up. Sentence 1: Rob and Chelsea were dating for 7 years. Sentence 2: She wanted to get married but he did not,so they broke up. Sentence 3: Rob began missing her very much after 3 months of being apart. Sentence 4: He knew that the only way to get her back was to marry her. Choices: a. So Rob bought a ring and proposed to Chelsea who happily said yes! b. Tom decided to just keep his current service.
A:
b