Select the option that can be used as a one –word substitute for the given group of words.
An eccentric manner of living

Correct option is A

Bohemian is a person who lives an unconventional lifestyle, often in an artistic or literary manner, and is thus a suitable one-word substitute for the given group of words.
 Meaning of the other words:
 Numismatist refers to a person who collects or studies coins and currency.
 Gourmet refers to a person who is knowledgeable about good food and drink.
 Misanthrope refers to a person who dislikes humanity and avoids human society.