Mi primo es de mi abuela.
a)nieta
b) tía
c)nieto
d)tío

C

Explanation:

To make it easier to answer let's translate the sentence

It would say, " My cousin is the ___ of my grandmother."

The answer choices would be

A Grand daughter

B Aunt

C Grandson

D Uncle

Now let's find the answer.

So we know for a fact that their cousin is male because of the ending in primo

Ending o = masculine and ending in a = feminine

So we can immediately eliminate a and b

We also know that cousin = child of uncle and aunt. And we know that either your uncle or aunt is a sibling of your parents. Which leads to one of them having the same parents ( or your grandparents) . This means that your parents siblings child ( cousin ) has the same grandparents.

So we can conclude that your cousins (male) is a grandson of your grandma