Hope this helps. Lady Macbeth may actually faint in astonishment that her husband has killed the guards in an act that was not part of their plan in murdering Duncan. She could be shocked that he has acted so boldly when she had to question his manhood in order to provoke him to kill the king. On the other hand, she may be faking.
The answer would be C.) Fighting for a noble cause.
Thank you :)
Answer:
It is a preposition because it cannot be either of the remaining three
