The inhabitants of the island were barbarians.

A. civilized

B. cruel

C. uncivilized

D. bad

Answer: Option A

Solution(By Examveda Team)

barbarians : an uncultured or brutish person.
civilized : polite and well-mannered.
cruel : wilfully causing pain or suffering to others, or feeling no concern about it.
uncivilized : not socially, culturally, or morally advanced.
bad : of poor quality or a low standard.

Antonym of barbarians is civilized