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 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: Cake. Sentence 1: Ava is nervous about her sweet sixteen tomorrow! Sentence 2: Ava never confirmed on all the preparations for the party. Sentence 3: Ava mom assures her that her party will be perfect. Sentence 4: Ava calls and confirms everything but forgot the cake. Choices: a. The day of the party Ava mom surprises her with the cake she picked. b. He ended up marrying her and moving to the small town.
b