Correct option is C
The word "nefarious" means wicked or criminal. The opposite is "admirable," which means deserving respect and approval.
· Synonyms: wicked, evil, vile, iniquitous.
· Antonyms:
admirable, good, honorable, virtuous.
Meanings of other options:
· Flagitious: extremely wicked or criminal.
· Execrable: extremely bad or unpleasant.
· Admirable: deserving respect and approval.
· Abominable: very bad or unpleasant.