Which Statement Best Defines the Concept of Public Relations

Which statement best defines the concept of public relations?

A) It is the practice of using the public to promote a company's products through vehicles like blogs.
B) It is the direct sale of goods at discount rates to the public at trade fairs.
C) It the creation of relationships with the media to help communicate messages to their customers, the general public, and governmental regulators.
D) It is the distribution of samples and coupons directly to the public.
E) It is the use of various forms of promotions to improve relationships with customers..