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.

Title: Duet. Sentence 1: I had a friend who played violin, and I played piano. Sentence 2: We decided to find something we could do together, so we looked online. Sentence 3: We found a piece called Danse Macabre. Sentence 4: After practicing for weeks, we finally had it ready. Choices: a. As a result, the wife helped to apprehend the brother. b. When we played in front of our friends, and they loved it.
a