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 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: Surfing Derick. Sentence 1: Derick pretended that his mother's ironing board was a surfboard. Sentence 2: He would stand on it and pretend he was riding the waves. Sentence 3: Derick broke his mother's ironing board. Sentence 4: Derick's mother tried to come up with the appropriate punishment. Choices: a. Derick's mother made Derick do all of the family's ironing. b. He started to write it.
b