What is the purpose of the passage in Question 3？

What is the purpose of the passage in Question 3？
A.to inform the reader about the website.
B.to entertain the reader.
C.to persuade the reader to continue reading for more information about how to write a business proposal.
D.to inform the reader about the business proposal.
正确答案：to persuade the reader to continue reading for more information about how to write a business proposal.