<h2>Right answer: somos
</h2>
The spanish verb ser (to be) is conjugated with each subject pronoun, as follows:
1st person singular: Yo <u>soy</u>
2nd person singular: Tú <u>eres </u><u>
</u>
3rd person singular: Él/Ella/eso/esa <u>es </u>
1st person plural: Nosotros <u>somos</u>
2nd person plural: Ustedes (In latinAmerica) <u>son</u><u>
</u>
2nd person plural: Vosotros (In Spain) <u>sois </u><u> </u>
3rd person plural: Ellos/Ellas <u>son
</u>
<u>
</u>
Now, this sentence is written in present tense with the first person in plural <em>nosotros </em>(we), therefore the right conjugation according the list aboveis <u>somos</u><u>.
</u>
Then the complete sentence is:
Nosotros <u>somos</u> mexicanos
<u>We are</u> mexican
The options soy (I am), eres (you are), son (they are) and es (he/she/it/is) are <u>not correct </u>because <u>do not match with the subject in the sentence in number or in genre.
</u>