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: I sighed with frustration when Ann cancelled yet another appointment. Sentence 2: I knew our coaching sessions were good for her when she chose to come. Sentence 3: Listening to her stammered excuse, I got a sudden flash of insight. Sentence 4: Acting on instinct, I asked her why she felt undeserving of success. Sentence 5: As silence gave way to tears, I knew we'd finally exposed her barrier. Choices: a. The Root of the Problem. b. Before It Gets Cold.

a