Question

Elena: Y ____________________ es Patricia López, mi mejor amiga. a. yo c. ella b. tú d. ustedes  

Answer 1

C - ella is the one to pick

Answer 2

Y ella es Patricia Lopez, mi mejor amiga. The question in English means And blank is Patricia Lopez, my best friend and now answered, it is ''And She is Patricia Lopez, my best friend, so answer is C) ella which in English means she and that makes the sentence true.