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: Oran bought binoculars. Sentence 2: He took them outside. Sentence 3: He saw birds. Sentence 4: He watched them. Sentence 5: They became his friends. Choices: a. Tunnels. b. Bird Watching.

b