Answer:
I wanna say vas because if I'm correct the Chart for Yo Tu and everything else (I forgot them- ;-; sorry about that) But it should be vas If no I do apologize for that!
UMMMM-
I DONT DO SPANISH
Explanation:
C. Había servido
C. ella is the answer.
Pueda
Tenga
Sirvan
Saca
Esté
Interese
Come
Diga
I think it is the first one but not sure
