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: Carlos needed new oil for his car. Sentence 2: So he went to a car store and bought some. Sentence 3: He put the oil in his car. Sentence 4: His car ran better now that it had new oil. Sentence 5: Carlos was glad. Choices: a. The Dog Sweater. b. Oil.

b