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: Dolphin Cruise. Sentence 1: Susan was very excited to take a dolphin cruise while in Florida. Sentence 2: She bought the tickets in advance. Sentence 3: She boarded the boat with a life jacket. Sentence 4: On the water, she felt extremely sea sick. Choices: a. It was quite an eventful journey that had together. b. She came back to land feeling disappointed at not seeing an dolphins.
a