I NEED HELP ASAP!!!!
Which of the following sentences demonstrates correct pronoun-antecedent agreement?

A.
Patricia was practicing her guitar solo when she accidentally snapped a string.
B.
Gabby would like to come to town for a visit, but his is too busy with school.
C.
Carla promised that us would take the dog for a walk after school today.
D.
Tina needs to buy a new pair of shoes now that we am going to the dance.