Option 1: Unfair -> This is a synonym of iniquitous, not an antonym.
Option 2: Wicked -> This is also a synonym, as iniquitous means grossly immoral or wicked.
Option 3: Virtuous -> This means morally good and righteous, which is the opposite of iniquitous.
Option 4: Hilarious -> This means funny/amusing, which is unrelated to the moral dimension of iniquitous.
Hence, Option 3: Virtuous -> INIQUITOUS means grossly unfair, wicked, or morally wrong. VIRTUOUS means having high moral standards and righteousness, making it the perfect antonym -> correct