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: Stumble. Sentence 1: Kia was walking along the breakwall by the sea. Sentence 2: Her mom walked on the ground beside her. Sentence 3: She urged Kia to get down before she fell in the water. Sentence 4: At first Kia refused, but then she stumbled and almost fell! Choices: a. As a result my husband sometimes thinks I'm crazy. b. After that, she hopped down willingly!
b