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'.

Sentence 1: When the animal shelter took Riley off the street, he was very sick. Sentence 2: He had heartworm, and treatment meant months of inactive kennel rest. Sentence 3: Restless and bored, Riley paced and cried, chewing his paws. Sentence 4: The staff got him bones to chew, interactive toys, and a radio. Sentence 5: Their understanding eased his confinement until he was well again. Choices: a. Frustrated Dog. b. The Sweatshirt.
a