Which of the Following Is Significant for Marketers to Understand

Which of the following is significant for marketers to understand about the use and outcomes of social media?

A) Marketers must realize that although they control all relevant content on social media sites,they must let users think that they,the users,do.
B) The ability to share experiences quickly and with such large numbers of people amplifies the impact of word of mouth.
C) Social media provide very basic methods of measuring how marketers meet and interact with consumers.
D) Social media is no substitute for traditional advertising as the former have little impact on a company's bottom line.