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.
Q: Title: Exhausting Walk. Sentence 1: Tim walked across campus in order to get to his class. Sentence 2: Since the class was far, he took several minutes. Sentence 3: At some point along the way, he passed out for a minute. Sentence 4: One of the school teachers picked him up. Choices: a. He tried to make Tim conscious again by giving him water. b. Since he only felt a small thud, he didn't bother to stop.
A:
a