The business is the content or general message of a conversation or what the conversation is about. Option A is correct.
Conversation may be defined as a talk between two or more individuals in which the convey thoughts, feelings, and ideas, ask and answer questions, or even news and information is exchanged. So, in a conversation were a message is delivered with an intention, the real message will have a specific content known as business.
I'd say the answer is the final one, or D. The story states the commendations that Dr. King gave Lincoln, the one who made the Emancipation Proclaimation and freed hundreds of thousands of slaves, and the joy and happiness he feels knowing that slavery was abolished.
I believe it is the last blue sentence
Types of persuasive techniques
The three types of persuasive strategies are logos, ethos and pathos, or L.E.P. The most effective persuasive communication usually has a mix of all three strategies. Logos uses logic or reason to reach a conclusion, while ethos depends upon the credibility of the author or source as support for action.