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'.
Q: Sentence 1: Kate needed to air out the musty basement. Sentence 2: She went outside to shovel the snow away from the windows. Sentence 3: She opened the windows in the basement to let in the fresh air. Sentence 4: Her mother came to find out where the cold air was coming from. Sentence 5: Kate had to close the windows and deal with the musty basement smell. Choices: a. Sewer. b. Shoveling.
A:
b