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 Train is Cheaper. Sentence 1: Nigel was traveling to visit his aunt. Sentence 2: He was looking at flights but they were all too expensive. Sentence 3: Then he saw that train rides were much more affordable. Sentence 4: He bought his ticket and hoped for the best. Choices: a. For the rest of his life, Jim lied for his own benefit. b. Luckily the train ride was not too bad at all.
Example Output: b

Example Input: Title: Dry. Sentence 1: The water flowed downhill. Sentence 2: One summer the weather was very dry. Sentence 3: The water stopped flowing near the top of the source. Sentence 4: The farmers near the source kept all the water. Choices: a. Ken wound up losing an easy race. b. The farmers farther away could not make enough food.
Example Output: b

Example Input: Title: Family. Sentence 1: Sarah's mom was visiting from Florida. Sentence 2: They went to Sarah's favorite restaurant. Sentence 3: They talked for hours without realizing the time. Sentence 4: They had talked passed closing time! Choices: a. Sarah tipped the waitress generously. b. They were both better off for the storm coming in.
Example Output:
a