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: Highest ice cream cone. Sentence 1: Joanna bought some ice cream at the store. Sentence 2: She had in mind to make the highest ice cream cone in the world. Sentence 3: She scooped as many ice cream balls as she could on top of the other. Sentence 4: But once she reached her number six, the ice cream tilted. Choices: a. In the end, Joanna had to clean all of it out of the floor. b. It had been years since they'd gone to the circus but this was fun!
b