If you plan to make a document for an audience, you want to do what they want to know, most likely.
So For A. You don't want to interest yourself, you want to interest the audience.
For B. Your readers are you priority, so knowing how much they know would help.
For C. Sources are whole other subject but to please them, you may worry about that a little less.
For D. Same as C
So B would be best.
Answer:
Consumer behavior impacts quality of life by letting the consumers purchase or acquire whatever product or service they want and therefore having a quality of life. Every time a person wants to buy something he or she knows they have a quality of life due to the expenses of their product.
Explanation:
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I think it is A but i am not sure