Final answer:
Cassio is appointed the new Lord Governor of Cyprus at the end of Shakespeare's 'Othello', following the tragic resolution of the play's events.
Step-by-step explanation:
At the end of the play Othello, it is Cassio who becomes the Lord Governor of Cyprus. After Othello realizes that he has been manipulated by Iago into believing that his wife, Desdemona, was unfaithful, he kills himself. Iago's treachery is revealed, and Cassio is appointed by Lodovico to be the new governor.
Desdemona, being a victim in the play, dies at the hands of Othello before any governance changes occur. Therefore, the correct answer to the question is c. Cassio.