The correct option is C Pseudonym
A pseudonym is a fictitious name, especially one used by an author. For example, "I wrote under the pseudonym of Evelyn Dashwood". Hence, Option D is correct. Among the rest of the options, title means the name of a book, composition, or other artistic work, nomenclature means the devising or choosing of names for things, especially in a science or other discipline, nickname means a familiar or humorous name given to a person or thing instead of or as well as the real name. These options do not express the intended meaning, hence incorrect.