The correct answer is (B) Terminology; a set or system of terms, as those used in a particular science or branch of knowledge; nomenclature used to classify things; systematic naming within a category.

Nomenclature comes from Latin nomenclatura (list of names).

Examples of use:

• Every field of study appears to have its own system of nomenclature.
• Much of the nomenclature in some fields is incomprehensible to an outsider.