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 Laptop. Sentence 1: Tom's old laptop was too slow. Sentence 2: Even with upgrades it wasn't able to keep up. Sentence 3: Tom decided to buy a new one. Sentence 4: He did a lot of researched and asked his friends. Choices: a. Eventually he bought a newer version of what he had. b. He took great care of it, washed it and filled it with gas.
b