What role does the exposition play? it ends the play
it builds the climax
it gives the character descriptions
it sets up the play

it gives the character description is the role the exposition plays.

Explanation:

The role that the exposition play in the plot is: The writer gives information about the setting, characters, situation, and the conflict is introduced. Explanation: When the background information is added in any story or narrative, it is said to be termed as narrative exposition

It gives the character descriptions.

dramatic irony occurs when the reader/audience knows more about a character's situation than the character does. the one main effect is that it gives the reader a sense of superiority, or detached superiority. the reader not only seemingly discovers what is revealed, but feels superior for doing so.

its repetition emphasizing that the chain is his own. sorry if i am wrong.