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: Bob was working in his shop. Sentence 2: He was building a shelf. Sentence 3: The shelf was going to house all his book. Sentence 4: He worked all day on it. Sentence 5: When it was finished, Bob was eager to hang it up. Choices: a. Excess Funds Needed. b. The Shelf.

b