Which of these could create static electricity? A. Plugging in a vacuum
B. Running a blender
C. Combing one's hair
D. Turning on a car

C. Combing ones hair

Because it’s like when you rub a ballon on your hair and your hair becomes static. And because if you look at the other options and do process of elimination you would get C.

A- that’s just electricity from a plug in
B- same thing as A
And
D- that’s with a engine and gas

(Hopefully this helped.)

And from google “Using plastic combs and brushes on your hair can cause static electricity, much like that old trick you did as a kid of making your hair stand up by rubbing a plastic balloon on it.”

Ido not understand. 

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.