Margaret came home after a long day of work to find her front door open and her waste basket knocked over with all of the contents strewn about the kitchen floor. She believes that her dog must have knocked it over in search for some food scraps to eat, but this belief cannot be correct. Her husband took the dog with him to work all day. The stated argument requires which of the following assumptions? ['Margaret has rats in her house.', "Margaret's husband accidently knocked it over on his way out the door this morning.", "Margaret's husband brought the dog home on his lunch break.", "Margaret's husband left the door open that morning and a raccoon got in."]