The correct option is C insolence
The word 'servility' refers to an excessive willingness to serve or please others.
Option A, bravery refers to courageous behaviour or character.
Option B, prudence refers to cautiousness.
Option C, insolence refers to rude and disrespectful behaviour.
Option D, slavery refers to the state of being a slave.
Thus, according to the meaning, the word 'insolence' is the opposite of the word 'servility'.