You will be given a definition of a task first, then some input of the task.
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: Shopping for toilet paper. Sentence 1: Jason went to the grocery store with a coupon for toilet paper. Sentence 2: He looked around the whole store but couldn't find his brand. Sentence 3: He asked an employee who even went in the back. Sentence 4: But they were out of that particular brand. Choices: a. Jason had to buy a new brand and trust it would be good enough. b. When asked to spell a simple word, she fumbled and missed it.
Output:
a