Hannah is driving a car up a hill. She observes that the car tends to slow down if she does not press down on the accelerator. Hannah sugests that friction between the and the road is causing the car to slow down. Which best explains why Hannah's suggestion is not a scientific theory?

A= Hannah's suggestion is a good idea held by an individual and based on a life experience.

B=Hannah is not a well paid scientist

C= Hannah's suggestion is a claim that has been well tested

D=Hannah's suggestion is not a well-supported and widely accepted explanation