Why did the writer give name his pet“Blackie"

My Pet
I have a pet rabbit. Mygrand father gave it to me for my birthday present. I give
name it Blackie, due to his black fur. Blackie has found red eyes, long ears and long tail. He
likes to eat carrots and green vegetables. It is fun to watch him nibble at his food. Blackle
lives in a small cage under our porch.

A. Because it has black eyes.
B. Because it's fur is black.
C. Because he likes black.
D. Because his mother likes black.​