Which of the following is a key reason to include allusions in a literary work?

to create new insights and ideas by associating unexpectedly similar objects
to explore humans’ relationships to ideals, inner lives, and environments
to broaden the context and deepen the meaning of a literary work
to equate a known object with an unknown or to-be-explained object

Question

Which of the following is a key reason to include allusions in a literary work?

 to create new insights and ideas by associating unexpectedly similar objects  
 to explore humans’ relationships to ideals, inner lives, and environments 
 to broaden the context and deepen the meaning of a literary work  
 to equate a known object with an unknown or to-be-explained object

anonymous · Answer

to equate a known object with an unknown or to-be-explained object

anonymous · Answer

I. to add humor

Il. to heighten effect

III. to create suspense

I and II  
I, II, and III  
I and III  
III only

anonymous · Answer

Is there more to this?