The correct option is D Fake
An antonym is a word that is opposite in meaning to another word.
The given word 'genuine' refers to a person who is sincere or an item that is authentic and original.
The opposite of 'genuine' would be 'fake', which means 'something that is not genuine, a counterfeit item.' Consider the expressions 'a genuine Louis Vuitton bag' and 'a fake Louis Vuitton bag'. Hence 'fake' is an antonym here and option D is correct.
'Literal' means to take words in its most basic sense, without metaphor or exaggeration. It is in no way related to 'genuine'.
'Exact' means 'precise', something that is accurate. It is similar to 'literal' and is neither synonymous to nor the opposite of the given word.
'Faithful' means 'loyal'. It is in no way connected to 'genuine'.
Hence options A, B, and C are incorrect.