ser is the correct I think
Is there any answers? choices? options. if there are, and one of them is NEW YORK, please proceed to pick that. If you must explain. please reply back to me. Thank You
It should be C. Esas.
Because "esas" means them/they, but in feminine form. So if we translate the sentence it would be: "Those/The girls in the picture are my cousins Malena and Alejandra"
Hope that helped :D