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: Bob Finds an Apartment. Sentence 1: Bob had recently gotten a new job. Sentence 2: He had to relocate to the city of Chicago. Sentence 3: Bob took a flight to Chicago the following day. Sentence 4: He stayed at a motel while searching for apartments. Choices: a. One day some younger kids took over our treehouse. b. After a week, Bob was able to find a place near his work.
b