We are given with a statement given above. The answer is D since there is no erratum involved in the sentence. Children is already plural hence placed after n. Monkey bars and swings are not in the state of owning something so there should not be any apostrophe placed.
"O, never/Shall sun that morrow see!" means "The morning when Duncan leaves here will never come, because we're going to kill him tonight." "Your face, my thane, is as a book where men/May read strange matters" means "By looking at your face, everybody can see what you're thinking." The rest of the speech means "To fool everybody, you have to behave the way everybody expects you to behave. You have to make sure that the way you look, the way you act, and the way you talk all seem to be giving Duncan a friendly welcome. You have to seem harmless even though you are secretly deadly."
