Final answer:
Iago manipulates Othello's emotions and poisons his mind with false information to arouse suspicion.
Step-by-step explanation:
Iago manages to arouse Othello's suspicion in the conversation between Cassio and Desdemona through a combination of manipulative tactics and false information. He uses Cassio's actions, such as his friendly interactions with Desdemona, to plant seeds of doubt in Othello's mind. Additionally, Iago skillfully reveals a fabricated affair between Desdemona and Cassio to further fuel Othello's suspicions. By manipulating Othello's emotions and poisoning his mind with false information, Iago successfully manages to arouse Othello's suspicion.