Which sentence uses the underlined pronoun correctly?
A.
Grandmother cooked all of our a special dinner last night.
B.
Grandmother cooked all of we a special dinner last night.
C.
Grandmother cooked all of us a special dinner last night.
A.
Grandmother cooked all of our a special dinner last night.
B.
Grandmother cooked all of we a special dinner last night.
C.
Grandmother cooked all of us a special dinner last night.