The correct answer is: C. Wild : Animal
Savage and civilized are antonyms. They are opposites. Savage means uncivilized or primitive. Civilized means having a high level of culture and development.
Wild and animal are also antonyms. They are opposites. Wild means not tame or domesticated. Animal means a living organism that is not a plant.
Illiterate and book are not antonyms. They are not opposites. Illiterate means unable to read or write. Book is a written or printed work consisting of pages enclosed in a cover and typically having a binding.
Dark and lighted are not antonyms. They are not opposites. Dark means not giving or reflecting light. Lighted means having light.
Brutal and heroic are not antonyms. They are not opposites. Brutal means cruel or violent. Heroic means having or showing great courage.
In conclusion, the correct answer is: C. Wild : Animal