Answer: option a: Somos
Step-by-step explanation:
The sentence that we must complete is:
De Argentina nosotros___
And the options are:
a) somos
b) eres.
You can see that the person in the sentence is "nosotros", so the correct option is "somos". The other conjugation is used for "Tú" as:
Tú eres.
While in our case, the full sentence would be:
De Argentina nosotros somos.