Answer: A. purpose, audience, context.
Explanation: The use of professional communication can be written or spoken, the professional communicators are usually people that are writers or public speakers as a profession. When using professional communication, the aspects we need to consider are purpose, audience and context. The purpose is the reason behind the text or speech, the audience is the people that the author want to address, and the context is all the things surrounding the text, like the time the author is creating, the political and historical context, for example.
