Which spanish sentence is written correctly?

ariana dice que mi casa está en buenos aires.
ariana dice que una casa está en buenos aires.
ariana dice que la casa está en buenos aires.
ariana dice que la casa de ella está en buenos aires.

Frank is from atlanta and maria tuberto barbero is from ciudad de méxico. they became pen pals and communicate by phone because they love to talk in addition to communication through emails. based on what you learned , how would frankk dial maria’s phone numbers when he talks to her