Since you didn't provide the excerpt, I am going to assume that the answer you need is 'hearken'.
I believe it’s B, i am not for sure though, just by context clues in the text, he seems to use them to get information of when the attack is
He worries<span> that Banquo </span>will<span> be suspicious of Duncan's murder so he decides to kill Banquo and his son Fleance in order to ensure that none of Banquo's people take the throne after him. He doesn't want people to know that hes guilty of killing the king.</span>
C: Topics like society, courage, and bravery