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: Kate and her class were observing a caterpillar. Sentence 2: But they couldn't find him. Sentence 3: They turned it's habitat hoping to see it. Sentence 4: But it was nowhere to be found. Sentence 5: Finally another kid found the caterpillar had gone into a cocoon. Choices: a. Church. b. Where is It.

b