Which of the Following Is a Difference Between Social Media

Which of the following is a difference between social media and personal selling?

A) Social media can disperse a message quickly to a wide audience,whereas personal selling is very slow in dispersing a message to a large audience.
B) Social media entail two-way communication,whereas personal selling entails one-way communication.
C) Social media are a means of interpersonal communication,whereas personal selling is a means of mass communication.
D) Social media provide opportunity for immediate feedback,whereas personal selling does not provide opportunity for direct feedback.