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: Roller Coaster. Sentence 1: One day, my friends and I went to an amusement park. Sentence 2: One of our friends claimed he could eat anything and not throw up. Sentence 3: We decided to test this, and we made him eat 4 funnel cakes. Sentence 4: We proceeded to go on the fastest roller coaster we could find. Choices: a. She took a deep breath as she enjoyed the little moments. b. After the ride, our friend threw up three times.
a