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: Fifteen Miles. Sentence 1: Bob was looking at a house in the town of Herington. Sentence 2: The agent laughed when Bob asked what he thought of the town. Sentence 3: The agent told Bob he actually lived on a farm fifteen miles away. Sentence 4: Bob guessed the agent's opinion wouldn't matter much then. Choices: a. Steph was so scared she wet her pants! b. The agent told him to the contrary, he knew the town very well.
b