Given the task definition and input, reply with output. 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: Working. Sentence 1: Yesterday was my last day at my job. Sentence 2: I had been working there for years. Sentence 3: All my coworkers were sad that I was leaving. Sentence 4: So they bought me a cake to say goodbye. Choices: a. I'm not scared of being on the subway anymore. b. I am going to miss my old coworkers.
a