Answer:
Hi!
The answer to your question is option B. “The president made an allusion to Shakespeare in his speech.
Step-by-step explanation:
Allusion, as defined here, is “an indirect reference” to something. In this case, option B is the right choice because the sentence is implying that the President made an indirect reference to Shakespeare in his speech, meaning that the President probably said or supported something Shakespeare said without saying that Shakespeare said that straightforward.
Option A, C and D are not the right answer because the word “allusion” has been misused and the correct word in those 3 sentences should be “Illusion”.