Given the task definition and input, reply with output. 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'.

Sentence 1: Warren went to hunt with his grandfather. Sentence 2: But as he didn't like the idea of killing animals, he made noises. Sentence 3: His grandfather told him to stop as he was alerting the animals. Sentence 4: But Warren would fall down or whistle. Sentence 5: His grandfather sighed and never took him hunting again. Choices: a. Happy Halloween. b. Against killing.
b