Given the task definition, example input & output, solve the new input case.
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.
Example: Title: Marcus Buys Khakis. Sentence 1: Marcus needed clothing for a business casual event. Sentence 2: All of his clothes were either too formal or too casual. Sentence 3: He decided to buy a pair of khakis. Sentence 4: The pair he bought fit him perfectly. Choices: a. Marcus was happy to have the right clothes for the event. b. He left in a huff for having his ideas mocked.
Output: b
Marcus is buying clothes for a business event and not presenting an idea.

New input case for you: Title: The Root of the Problem. Sentence 1: I sighed with frustration when Ann cancelled yet another appointment. Sentence 2: I knew our coaching sessions were good for her when she chose to come. Sentence 3: Listening to her stammered excuse, I got a sudden flash of insight. Sentence 4: Acting on instinct, I asked her why she felt undeserving of success. Choices: a. As silence gave way to tears, I knew we'd finally exposed her barrier. b. Seeing that they had hot food, the police officer let them go.
Output:
b