Answer:
(D) the nobles' suspicions about him.
(D) inexperience in crime.
Step-by-step explanation:
52. Although the passage is not included, we can still analyze what Macbeth's main worries were when initially planning his murderous plot. Macbeth is worried about his guilt being revealed eventually. He also worries about Macduff betraying him, being punished for the murders and the supernatural events that keep happening about him. However, he is never particularly concerned with the nobles' suspicions about him.
53. Macbeth attributes his strange behaviour to his inexperience in crime. Macbeth believes that the difficulty he has in carrying out a crime, dealing with his guilt and behaving normally is a consequence of the fact that he had never engaged in crime before. He believes that soon, such a situation will hold less power over him and he will be able to go "back to normal."