The uniqueness of his speech is that it is showing sympathy.
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.
They are filming a country food stamps campaign.
One way to figure out the meaning of an unfamiliar word is to know how it is used in the sentence it is part of. If you understand the context of the sentence then its meaning can be inferred from the sentence usage.
It is also better to look it up in the dictionary to further know the meaning of the word, its etymology, and usage. This is to support your initial understanding of the unfamiliar word as part of the sentence you have read.