Which is a correctly written sentence, not a run-on?

AHe hit the ball over the net, the ball went out of bounds.

BShe said I could help with dinner, and she had me chop onions.

CShe packed her suitcase full of clothes and books, she couldn't even lift it.

DHe planned on visiting Grandma this Sunday he has to go to work. I say its C please correct me if im wrong (: