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: The Fish Tank. Sentence 1: Pat's mom wouldn't let him have a pet. Sentence 2: She agreed to let him have a fish as long as he cleaned the tank. Sentence 3: They got a large fish tank that took a lot of effort. Sentence 4: Pat decided it was too much work for him. Choices: a. He gave the fish away to his friend. b. Before the sun settled, Ana was found.
b