El colegio (participar) en deportes
a) participa
b) partcipamos
c) participo
d) participais

The correct answer is

a) participa

This makes the sentence:
El colegio participa en deportes.

This is because colegio is a singular noun, which means it has the same verb conjugation as the subject pronouns él, ella, and usted.

I hope this helps! :)

Am i 2