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: Know your boundaries. Sentence 1: James had a huge fear of heights. Sentence 2: He would not ever close to the edge of tall buildings. Sentence 3: Once, he had a panic attack when using a glass elevator. Sentence 4: They had to call the medic to help him calm down. Choices: a. Now, James uses the stairs every time. b. He worries what his girlfriend will think if he's outgoing.
Example Output: a

Example Input: Title: New friends. Sentence 1: Leslie recently got a rescue dog. Sentence 2: The dog was scared of other dogs because it had been bitten once. Sentence 3: Leslie wanted to make her dog happy by finding it a playmate. Sentence 4: After a lot of trial and error the dog finally warmed up to a puppy. Choices: a. The two dogs have played together daily ever since. b. Will has never done such a dumb thing since.
Example Output: a

Example Input: Title: Stormy Weather. Sentence 1: Roberta heard a crack of thunder. Sentence 2: Her house shook. Sentence 3: The electricity went off. Sentence 4: Roberta lit a candle so she could see in the dark. Choices: a. Buster even had a small pinecone stuck to his fur. b. The power came back on after the storm passed on by.
Example Output:
b