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
I cant see the pic but if its imperfect then it includes: age,time,emotion,etc.
The type of treatment that involves pressing specific points of the body to provide pain relief is acupresión