Yo veo un avión, I see a plane
El es/esta gordo depending on past or present
Se ve is the correct answer
The answer is c. somos.
Since the subject is nosotros, we have to conjugate the verb to make them match. son matches with 'ellas, ellos, or uds.', somos matches with 'nosotros', eres matches with 'tú', and es matches with 'ello, ella, or ud.'