You all (supporters of Drink Up] reached out to some of the brightest minds in advertising and research, and some of the biggest media and Internet companies as well as celebrities and elected officials from across the country who helped out on this campaign. And together, they launched a nationwide marketing campaign for water, a campaign featuring public service announcements, branded re-useable water bottles, social media and so much more.

And as a result of this effort, today, I am thrilled to announce that less than one year after Drink Up was launched, bottled water sales went up three percent among folks who saw these ads.

- Michelle Obama, "Remarks by the First Lady at a 'Drink Up' Event" (speech) 1

Which option best describes the type of argument used by First Lady Michelle Obama in this excerpt from a speech promoting Drink Up, a program that encourages kids to drink more water?

O A. An argument by authority based on her position as the First Lady and a mother
O B. An argument of ethics, explaining that drinking water is healthy for children O C. An argument by analogy that compares Drink Up to a nationwide marketing campaign
O D. A cause and effect-argument that shows the reasons for the success of the campaign