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: Adam goes too fast. Sentence 1: Adam is driving too fast down the road. Sentence 2: His car started to make a loud noise. Sentence 3: He pulled over to see what was wrong. Sentence 4: The engine was smoking very badly. Choices: a. The day rent was due Randy was nowhere to be found. b. He backed away from the car and called for help.
a