What is the author’s purpose in writing this passage? A) to call on the middle class

What is the author’s purpose in writing this passage？

A) to call on the middle class to remain loyal to the free enterprise system

B) to warn the government of the shrinking of the American middle class

C) to persuade the government to change its current economic policies

D) to urge the middle class to wake up and protect their own interests

请帮忙给出正确答案和分析，谢谢！