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: Helpful Friend. Sentence 1: Carl was arriving home from the airport. Sentence 2: He wanted to save on a taxi. Sentence 3: He asked a friend if they could pick him up. Sentence 4: The friend agreed. Choices: a. Carl bought them dinner as a way of thanking them. b. Jill is 45 minutes late.
b