The correct answer is B. Context
Step-by-step explanation:
In texts and other materials, context words refer to important words related to the specific subject of the material that helps the reader to understand key ideas and the context of the material. For example, in a medical article words such as disease, treatment, diagnosis, and similar act as context words because these show the article belongs to the medicine area, and also they help the reader to understand details in the articles. Thus, keywords for understanding a particular subject and its materials are also known as context.