Final answer:
The antonym of 'urbane' is 'boorish' as it describes someone who is the opposite of refined and courteous. The correct option is a.
Step-by-step explanation:
The term 'urbane' refers to someone who is suave, courteous, and refined in manner. Thus, the antonym of 'urbane' would be a word that describes the opposite of these characteristics.
Given the choices provided, the antonym would be boorish, which means rough and bad-mannered; the complete opposite of urbane.
Option b. witty is not correct as it indicates clever humor, which can be a trait of someone who is urbane.
Option c. unfamiliar is irrelevant as it pertains to awareness, not personality or behavior. Option d. sophisticated would be a synonym rather than an antonym for urbane.
Therefore the correct answer is a.