Synonym of MELLIFLUOUS

Answer: Option C

Stupid : having or showing a great lack of intelligence or common sense.
Stale : (of food) no longer fresh and pleasant to eat; hard, musty, or dry.
Sweet : (of sound) melodious or harmonious.
Tasteful : showing good aesthetic judgement or appropriate behaviour.
Mellifluous : (of a sound) pleasingly smooth and musical to hear.

Synonym of Mellifluous is Sweet