Why does orwell use allegory in animal farm?

Plz change it i can not change this sentences .

The following question is based on your reading of a midsummer night’s dream by william shakespeare. why does puck transform bottom? a. to disrupt the play. c. to scare the mechanicals. b. for revenge on theseus. d. to scare the lovers.

Which major world event was near the birth of the modernist movement