Option 1 -> Refined means cultured or polished; not related to talkativeness.
Option 2 -> Articulate means expressing oneself clearly and fluently; similar to voluble, not opposite.
Option 3 -> Taciturn means reserved, quiet, or inclined to silence; directly opposite to voluble.
Option 4 -> Effusive means expressing feelings freely and enthusiastically; similar to voluble, not opposite.
Hence, Option 3: Taciturn -> "Voluble" means talkative and speaking readily at length, while "taciturn" means habitually quiet and reserved in speech, making them perfect antonyms -> correct