Q: 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: How Grandma Trolled the Grandkids.. Sentence 1: The grandchildren were watching TV when grandma came in and sat down. Sentence 2: The show suddenly made several jokes containing innuendos. Sentence 3: Grandma noticed the grandchildren tense up and had an idea. Sentence 4: Grandma, playing dumb, started asking what the innuendos meant. Choices: a. They squirmed silently and didn't know that they were being trolled. b. His ad career ruined, he flips burgers now at McDonald's.
A:
a