How to say "which do you prefer: lemonade or soda" in Spanish​

Does anyone know what my spanish teacher means by this? i need to use plural forms of the verb ser. and she asked me to use a couple of adjectives to describe the boys collectively and then the girls collectively?

Which of the following is a common subject of teodor núñez ureta's paintings? a. andean peasants b. cuzco city life c. traditional peruvian food d. the spanish conquest of the incas

Which words fit best in the blanks below? —mi primo pepe es cartero. —¿pepe el correo los domingos? —no, los domingos pepe y los padres de pepe la tele en casa. a. entrega; miramos b. entregas; miran c. entrego; miramos d. entrega; miran