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: Allie decided to host a French student. Sentence 2: The French student came for a few months. Sentence 3: The girls became fast friends. Sentence 4: Allie then decided she wanted to go to France to study. Sentence 5: So when her friend went back to France, Allie joined her. Choices: a. Baby Changes. b. Exchange student.

b