Which of the following best completes the following statement,'Social media are relatively inexpensive ways to increase the ______ and ______ of messages that are otherwise delivered via more traditional,big media methods.'?

A) Reach,frequency.
B) Effectiveness,stickiness.
C) Reach,stickiness.
D) Effectiveness,frequency.
E) All are true.

The statement is referring to the ability of social media to increase the reach (the number of people who see the message) and frequency (the number of times the message is seen) of messages in a cost-effective way. Option A best completes the statement by providing the two most relevant terms that reflect this idea. The other options either provide inaccurate or incomplete terms or introduce irrelevant concepts.