The correct option is A Rude
The word 'urbane' refers to being courteous and refined in manner.
Option A, civilised refers to a stage of social and cultural development considered to be more advanced.
Option B, slow refers to moving or operating at a low speed.
Option C, rude refers to being offensively impolite or bad mannered.
Option D, foolish refers to lacking good sense or judgement.
Thus, according to the meaning, the word 'rude' is the nearly the opposite of the word 'urbane'.