Question

¿De que nacionalidad ____ (ustedes)?
Son
Sois
Eres

Answer 1

The answer is eres
Explication : what the question is trying to ask is what nationality are you and if you put son it wont make sense

Answer 2

son

Step-by-step explanation:

it would usually be sois but ustedes is plural so the answer is son

have a great day <3