Option 1 -> "Uncouth" means lacking refinement, good manners, or grace - the direct opposite of sophisticated.
Option 2 -> "Uncreative" refers to lacking creativity or originality, which is unrelated to sophistication.
Option 3 -> "Unimaginative" means lacking imagination, which doesn't contrast with being sophisticated.
Option 4 -> "Unsure" means lacking confidence or certainty, which is unrelated to sophistication.
Hence, Option 1: uncouth -> "Sophisticated" means refined, cultured, and worldly-wise, while "uncouth" describes someone who is crude, awkward, and lacking refinement - making them perfect antonyms -> correct