The comely young girl proved to be a good receptionist.

Answer: Option B

Comely : (typically of a woman) pleasant to look at; attractive.
Inexperienced : having little knowledge or experience of a particular thing.
Unattractive : not pleasing or appealing to look at.
Gloomy : dark or poorly lit, especially so as to appear depressing or frightening.
Depressed : (of a person) in a state of unhappiness or despondency.

Antonym of Comely is Unattractive