"Happy" and "unhappy" areA．non－gradable antonyms.B．root antonyms.C．derivational antonyms.D

"Happy" and "unhappy" are

A．non-gradable antonyms.

B．root antonyms.

C．derivational antonyms.

D．conversives.

请帮忙给出正确答案和分析，谢谢！