Which sentence below demonstrates incorrect subject-verb agreement? a. instead of theater, avery's talent is focused on small scale documentaries. b. the documentaries focus on the changing views of youth on performing arts. c. although avery is relatively unknown today, he is slowly gaining popularity. d. just like his siblings, avery show great promise in becoming a dynamic actor.

D. Just like his siblings, Avery show great promise in becoming a dynamic actor.

The subject of this sentence is Avery. Even though silblings are mentioned, they are only being used as a point of comparison. The verb is show. Avery is a third-person singular subject, but show does not agree with third-person singular. It needs to be shows. Many times the correct form of the verb for third-person singular adds s. For example, Mike walks, Sara sings, James kicks. 

We others out on questions they have about school work and etc.