How do the authors of “ads: why we buy what we buy” convey their purpose of persuading readers that advertising has changed the daily lives of many people?

A. They describe the origins of ivory and pears’ soap.

B. They explained the beginnings of post and Kellogg’s breakfast cereal.

C. They described the floor mat sale display at Walmart.

D. They explain why Coca-Cola use a new version of Santa Claus.