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.

Title: Dancing Partners. Sentence 1: Jane likes to dance. Sentence 2: Jane's husband doesn't know how to dance. Sentence 3: Jane tries to teach him but he doesn't seem to be getting better. Sentence 4: Secretly Jane's husband goes to a professional for training. Choices: a. When the teacher gave him his grade of a B-, Bill was shocked. b. Jane is surprised when her husband is dancing better than she is.
b