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: The Ladder. Sentence 1: John was fixing a shingle on the roof. Sentence 2: He put a ladder up against the house. Sentence 3: John began to climb up the ladder. Sentence 4: His dog ran into the ladder. Choices: a. When they were six months old, our chickens began laying eggs! b. The ladder shook and John fell.
b