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: Becky just had a baby. Sentence 2: Becky's husband left her for a younger woman when she was pregnant. Sentence 3: Becky tried to sleep for a few minutes but the baby started crying. Sentence 4: She changed the baby's diaper and rocked it to sleep. Sentence 5: Becky laid down again hoping for a few minutes of rest. Choices: a. Building Blocks. b. Diaper Duty.

b