Final answer:
The primary purpose of sketches in the context of sketches and photography is to provide a quick and rough draft of the subject before capturing a photograph.
Step-by-step explanation:
The primary purpose of sketches in the context of sketches and photography is A. To provide a quick and rough draft of the subject before capturing a photograph. Sketches are used as preliminary drawings to plan compositions and capture the main aspects of a subject before creating a final artwork or taking a photograph.