Which verb form would you use with ellos ellas or ustedes

Choose the sentence that is grammatically correct. a. la comida es del senora b. la comida es de el senor c. la comida es del senor

What did the mexican solders eat during 1833

My spanish teacher said to make these sentences into "ar" verb conjugations. can someone plz me with that? 1. ellos están en la computadora 2. la chicas están estudia 3. la chicas están hablamos 4. el ojo de el señor es marrón 5. la muchacha es feliz 6. la muchacha cantar