In the tragedy of macbeth, act ii, scene ii, lady macbeth’s purpose in drugging the servants is a. so they will commit king duncan’s murder. b. so they will sleep through king duncan’s murder. c. to erase their memory of the night. d. to kill them for their knowledge of the crime.

b. so they will sleep through King Duncan’s murder

Lady Macbeth needs them to be asleep through the murder and wake up with fuzzy memories because then she and Macbeth will be able to frame them for the murder. While they're asleep she smeared their hands and faces with blood and put the daggers in their hands so it looked like they committed the crime. 

Allusion and illusion. an allusion is an indirect reference, whereas an illusion is something that is unreal or incorrect. each of the nouns has a related verb form: allude “to refer indirectly to,” and illude (not a very common word), which may mean “to delude or deceive” or “to subject to an illusion.”