Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: The man put a plastic cover on his new couch. Sentence 2: The cover kept the couch clean. Sentence 3: Guests did not sit on the couch. Sentence 4: One of the guests complained about the plastic. Sentence 5: The man took the plastic cover off his couch. Choices: a. Birthday Surprise. b. Couch.

b