The beautiful girl looked so morose.

Answer: Option D

Morose : sullen and ill-tempered.
Healthy : in a good physical or mental condition; in good health.
Gloomy : dark or poorly lit, especially so as to appear depressing or frightening.
Haggard : looking exhausted and unwell, especially from fatigue, worry, or suffering.
Cheerful : noticeably happy and optimistic.

Antonym of Morose is Cheerful