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: My daughter's college roommate Sara has a rich father. Sentence 2: She lives in CA, while my daughter is in NYC. Sentence 3: Her father wanted to surprise Sara on her 30th birthday. Sentence 4: She paid for my daughter and friends to fly from NYC to CA. Sentence 5: Sara was very pleased. Choices: a. Rich Father. b. The Thief.

a