Given the task definition and input, reply with output. 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: Grilled cheese. Sentence 1: Parker had just made a grilled cheese sandwich. Sentence 2: Just as he was about to eat it, he got a phone call. Sentence 3: He went to the other room to talk. Sentence 4: When he came back, his sandwich was gone. Choices: a. He looked around and saw his cat eating his it. b. In the same moment, Ivy recovered and continued on to the platform.
a