Given the task definition and input, reply with output. 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: Dan's heartbreak. Sentence 1: Dan is a man in love with his girlfriend. Sentence 2: He has plans to propose to her. Sentence 3: On the evening he is set to purpose. Sentence 4: He gets down on one knee and asks his girlfriend to marry him. Choices: a. When he woke up he missed the test, b. She tells Dan no and that they should see other people.
b