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.

Example Input: Title: The Tip. Sentence 1: Maxine worked the overnight shift at the diner. Sentence 2: An old man would always come in and sit in her section. Sentence 3: One day, she noticed he seemed down in the dumps. Sentence 4: She sat across from him and they talked for a while. Choices: a. She thanked everyone for checking the video out. b. He left her a ten dollar tip on a six dollar tab.
Example Output: b

Example Input: Title: A Change. Sentence 1: Bob's car broke down in the middle of the road. Sentence 2: As he stood there waiting for help, he had an epiphany. Sentence 3: His car had brought him nothing but trouble and pain. Sentence 4: As soon as it ran, Bob took it into a lot and sold it. Choices: a. He bought a motorcycle and is happier than he ever was with his car. b. I took him home and we became best friends.
Example Output: a

Example Input: Title: Harry. Sentence 1: Harry is a 78 year old PhD who lives in the building. Sentence 2: He talks to the concierges a lot. Sentence 3: He is not popular, as he is arrogant. Sentence 4: He had been away, but returned yesterday. Choices: a. It took an hour to get him up the stairs. b. I saw him talking to the concierge, who was not happy.
Example Output:
b