Actually, the superlative form of "bonita" wouldn't be "bonitísima", it would merely be "muy bonita". Just like "very beautiful", not "beautifullest"
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
