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: New Puppies. Sentence 1: Colleen bought two dogs today. Sentence 2: They are both puppies and need to be trained. Sentence 3: Every morning they go to the bathroom in the house. Sentence 4: Colleen took them to a one month obedience school. Choices: a. A month later there were no more bathroom accidents. b. He led the team in spikes and blocks!
b