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 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: Ironing. Sentence 1: Sally ironed the shirt. Sentence 2: Her son distracted her. Sentence 3: She made a burn mark on the shirt. Sentence 4: She blamed the son. Choices: a. Her son refused to take the blame. b. Rita brought the store cookies to the PTO sale.
a