The correct answer is: B. Pseudonym
A pseudonym is a name adopted by an author in his writings. It is often used to conceal the author’s real name, for reasons of privacy or to protect the author from criticism. Pseudonyms can also be used to create a different persona for the author, or to give the author a more marketable name.
A nickname is a name that is given to someone in addition to their real name, often as a term of endearment or familiarity. Nicknames can be based on the person’s appearance, personality, or interests.
Nomenclature is the system of names used in a particular field or discipline. It can also refer to the act of naming things.
A title is a word or phrase that indicates the rank, position, or office of a person. It can also be used to refer to a work of literature, art, or music.