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: Can't Do Simple Math. Sentence 1: At the cash register a customer held out a credit card to Jenny. Sentence 2: Next the customer said, wait, I have a twenty, a passed the bill. Sentence 3: But, now, Jenny's register won't calculate the change. Sentence 4: There wasn't a pen or paper nearby so Jenny could do the math. Choices: a. Luckily her family ate them anyway. b. She couldn't in her head and the customer said, can't do simple math?
a

Title: marijuana. Sentence 1: When I was a teenager I smoked marijuana. Sentence 2: I didn't think it was going to harm me. Sentence 3: All of my friends were doing it. Sentence 4: I didn't want to feel left out. Choices: a. The shops had closed for the evening. b. However, it ended up getting me fired from my first job.
a

Title: Voting. Sentence 1: My son received an official looking letter. Sentence 2: It requested that he change his voter registration address. Sentence 3: I was about to give it to him. Sentence 4: I looked and saw it was from a non profit political group. Choices: a. I ignored the letter. b. I proudly showed it off on Snapchat.
b