A box has appeared on your doorstep, what do you do?

You decide to go with the more delicious of the two, eating the left over hamburger cold, most food is better this way. You hear a knock at the door, you go to see who it is, when you open the door no one is there, you're about to close the door when you see a large box on your doorstep. Do you...

A)Leave the box outside

B)Bring it inside