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 issued a command. Sentence 2: His crew obeyed the command. Sentence 3: He rewarded the crew with extra vacation. Sentence 4: They felt thankful. Sentence 5: They worked even harder in the future. Choices: a. First time drinker. b. Command.

b