Lago's plan starts to fall in place because he lacks moral restraint and callously exploits Othello's hamartia, his trusting nature, to cause chaos and strife among the characters.
The Dilemma of loyalty and also demonstrates the dark side of human nature like betrayalism.
It would be letter a, since an interrogative sentence is question. Since the first answer is the only one with a question mark, the answer is a.
The answer would be D. Preview.