Concept- Urbane means sophisticated and courteous in nature. it's an adjective.
Antonyms are the words that mean the other of every other. Thus, we are able to infer that the right antonym of urbane must mean the other of it. allow us to analyze the given options one by one to search out the right antonym of urbane.
Rural - regarding the countryside or a village belt. it's an adjective.
Indifferent - r having no concern or interest. it's an adjective.
Rude - to be unsophisticated and impolite in nature. it's an adjective.
Negative - being pessimistic or not desirable. it's an adjective.
Hence, the correct answer is option 3 – rude.