The definition A mark used in the sale or advertising of services to
identify the services of one person and distinguish them from the
services of others refers to a:

A.
Trade name

B.
Trademark

C.
Service mark

D.
Copyright

Explanation:
For answer “a trademark” is a distinctive mark of authenticity,
through which the products of particular manufacturers or the
vendible commodities of particular merchants may be distinguished
from those of others.
Answer “a trade name” is any designation
which is adopted and used by a person to denominate goods which
he markets, or services which he renders or business which he
conducts. A trade name is descriptive of a manufacturer or dealer
and applies to business and goodwill. A trademark is applicable
only to vendible commodities.
In answer “a copyright “is an
intangible, incorporeal right granted by statute to the author or
originator of certain literary or artistic productions, whereby he is
invested, for a statutorily prescribed period, with the sole and
exclusive privilege of multiplying copies of the same and publishing
and selling them. (These definitions were also taken from Blacks
Law Dictionary, Abridged Fifth Edition, West Publishing Company,
St. Paul Minnesota , 1983.)