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: David was nervous about the first day of school. Sentence 2: His mother encouraged him to be brave. Sentence 3: David got onto the school bus in the morning. Sentence 4: He sat next to a nice boy on the bus. Sentence 5: David made a new friend by the time they got to school! Choices: a. Dave's lost textbook. b. First Day of School.

b