The correct answer would be option B, Sienna, who is buying a phone that she will use for her business calls.
Sienna, who is buying a phone that she will use for her business calls is functioning as a consumer. 
Explanation:
In simple words, a person who consumes something is called a consumer. When a person pays for something to buy a product or service to be used or consumed by himself, he is called as a consumer. 
So when Sienna is buying a phone that she will use for her business calls, she is basically buying a product to be consumed by herself by paying for it. So Sienna is acting as a consumer in this example. 
Learn more about Consumers at:
brainly.com/question/3096413
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Answer:
D. Do a search to see if multiple outlets you trust are also covering the same story