The correct answer is "treinta y tres" because it is the only option that translates to "thirty-three" in Spanish. "Tres" means "three" and "treinta" means "thirty," so when combined, they form the number "thirty-three." The other options, "tres," "treinta," and "trece," translate to "three," "thirty," and "thirteen" respectively, which are not the correct translation for "thirty-three."