It is A, you are saying masculine because it is several people and when there are more than one it defaults to masculine. you dont however use plural again beacuse you will be referring to the dog. if there was more than one dog you would use C. But there is only one dog, so the correct answer is A
La camarera deposita la carta de bebidas en la mesa y pregunta a Federico y a mí. Primero, yo quiero café. Segundo, le toca a Federico; él quiere agua. cuida; me toca a deposita; le toca a bebe; me levanta recoge; le levanta I think it is B but im not sure
