Review the letter to the editor and then answer the question.
As a parent, I'm concerned that students are buying soda in the school cafeteria every day, which affects their ability to learn. Too much sugar and caffeine makes it challenging for our students to concentrate. In addition, soda consumption can contribute to long-term health problems such as obesity and diabetes. I am not suggesting that Sparrowtown's public schools should dictate what students eat and drink, but I do believe our schools should promote and foster healthy lifestyles, including proper nutrition. Students should be allowed to bring their own soda from home, but offering soda in our cafeterias is unacceptable.
What is the text's main purpose?
A) to prove that the writer is taking a reasonable position
B) to inform parents of the effect of nutrition on their children's education
C) to convince readers that soda should not be consumed in sparrow towns schools
D) to convince readers that soda shouldn't be sold in sparrow towns school cafeterias
