Please answer the following question by reasoning step-by-step.
The human wanted to give a bone as a reward, where did he put it?\nOptions:\n- skeleton\n- human body\n- dog's mouth\n- fresh fish\n- barn

dog's mouth
Bones are chewy.

Dogs like to chew bones.

Rewards are given to dogs by humans.

Dog's mouth can be used to chew bones.

.

The final answer: dog's mouth