Final answer:
Iago's advice to Cassio is to become friends with Desdemona and use her good word to regain his position from Othello. Hence the correct answer is option A
Step-by-step explanation:
In Shakespeare's play Othello, Iago's advice to Cassio at the end of the scene is to become friends with Desdemona and use her good word to regain his position from Othello. By forming a connection with Desdemona, Cassio can appeal to her influence on Othello and potentially convince him to reinstate Cassio in his former role.
Hence the correct answer is option A