The correct answer is the following.
The author includes details about Meg drinking her milkshake because he wants to convey to the reader the flavors and the manner Meg enjoyed her milkshake and slurps and transmit this moment so the reader can be part of it. American people slurp when they drink a milkshake. And the Chinese can slurp too.
We are referring to a moment in the novel “The All American Slurp”, written by Lensi Namioka. The author describes differences between the American culture and the Chinese culture, but also find similarities in both.