Which option is the best example of a theme?
Let’s see if we can make the peg round.
Alicia did not realize the peg was square.
You can’t fit a square peg in a round hole.
I tried to fit a square peg in the round hole

You can't fit a square peg in a round hole would be the theme, I think.

Explanation:

in macbeth, banquo, who in real life had willing in the murder of king duncan, is portrayed as a loyal subject of the king himself. many analysts believe that shakespeare had done this in order to king james, who supposedly was a direct descendant of banquo himself.

hope this ! : )