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: Tammy sees a snake.. Sentence 1: Tammy was hiking through a forest in Northern California. Sentence 2: As Tammy was hiking she decided to take a rest on a large rock. Sentence 3: Tammy sat down on the large rock. Sentence 4: As Tammy was sitting on the large rock she heard leaves rustling. Choices: a. Tammy saw a snake slither out from under the rock she was on. b. He sat down on the couch, dejected.
a