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: Holding on for dear life. Sentence 1: I bit the bullet and went on my first roller coaster yesterday. Sentence 2: I decided to go on a relatively small coaster. Sentence 3: However they did not seem to strap us in very well. Sentence 4: So as the ride started I held on for dear life. Choices: a. I was screaming as loud as I could and couldn't wait until it was over. b. He couldn't believe his luck in finding a new hobby and girlfriend.
a