CASSIUS. Why, man, he doth bestride the narrow world Like a Colossus, and we petty men
Walk under his huge legs, and peep about
To find ourselves dishonourable graves.
Men at sometime were masters of their fates.
The fault, dear Brutus, is not in our stars,
But in ourselves, that we are underlings.
 
–The Tragedy of Julius Caesar,
William Shakespeare

Why does Cassius refer to a Colossus in this passage?

to show that the Roman republic is huge

to show Cassius is stronger than Caesar

to show the Romans need a strong leader

to show Caesar puts himself above Rome