Read the following context and choose the best option to answer the question.
Context: His whistle slowed questioningly as he looked around . The kitchen , which was situated by the door , was empty , as was the living room . I 'll just leave the book where Kai can find it , he decided , and stepped into the kitchen , closing the door firmly behind him . He was about to leave it on the counter , but then he spotted the freshly baked tarts . Immediately his mouth began to water .
Question: Why might the narrator be leaving a book ?
Options: 
A. He thinks Kai will enjoy it
B. He wrote it himself
C. He wants Kai to pay him for it
D. He does not want it any more


A