ana es la __ de juan. \nhermana \nnieta \nprima \nsobrina

Brief Explanations:

In Spanish, "prima" means cousin. From the family tree context, it's the most appropriate term for the relationship between Ana and Juan among the given options. "Hermana" is sister, "nieta" is granddaughter, and "sobrina" is niece, which don't fit as well as "prima" in a general family - tree cousin - like relationship assumption (without full tree details but based on common family - term usage).

Answer:

C. prima