Final answer:
The domain of writing that involves focusing on the main topic and understanding the intended audience is 'Focus'. It requires examining the subject from a rhetorical perspective, engaging the audience, and demonstrating understanding of the cultural context and genre of the subject.
Therefore, option C is correct.
Step-by-step explanation:
The domain of writing that involves the writer concentrating on a main topic and showing that he/she knows and understands the intended audience is Focus. In this domain, the writer examines the subject from a rhetorical perspective and identifies the intended audience, purpose, context, media, voice, tone, and persona. The writer also demonstrates understanding of the cultural context and genre of the subject of the review. Audience awareness and the ability to engage the audience are key elements of this domain.