Question

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

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

B.
He planned on visiting Grandma this Sunday he has to go to work.

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

D.
He hit the ball over the net, the ball went out of bounds.

Answer 1

I think is A. but not 100% sure.

Answer 2

Hi, Ignaciocolmener!

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

This, unlike the other sentences, is not a run-on because this one has the conjunction "and" combining the two sentences. 

Hope this helps :)