Why does the narrator invite the police to sit down in the room where the crime was

Question

committed?
A. He didn’t realize which room he was in.
B. He wanted to prove he didn’t have anything to hide.
C. They showed up before he had killed the old man.
D. He knew he was going to tell them what he had done.

Answer 1

D. He knew he was going to tell them what he had done.