A seems to be the best answer but i could be wrong
The correct answer is B. an allusion
Foreshadowing is when you use symbols to tell what's going to happen in the future, a hyperbole is over-exaggerating, while symbolism is using symbols to represent other concepts. Allusion is used for referring to famous works.
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In Act IV, Iago references his "medicine," which is doing its work.
He is referring to the rumors he started involving Desdemona. He says that this "medicine" is the way to catch "credulous fools" -- meaning that Othello is gullible enough to believe the lie Iago started.
With his medicine, or his lies, Iago is bringing about Othello's destruction. He is happy to see Othello believing Desdemona is unfaithful.
