Q: 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: Tim Plants A Tree. Sentence 1: Tim was concerned about the environment. Sentence 2: He read that planting a tree was beneficial for the environment. Sentence 3: Tim decided to plant a tree in his backyard. Sentence 4: He watered it every day. Choices: a. Tim was happy to be helping the environment. b. He put the books back on the shelf so others could check them out.
A:
b