According to the format approach, there is a radio ad copy that have a function to describing some information and usually used for public service ads. What is the name of that radio ad copy?

According to the format approach, there is a radio ad copy that have a

1.	According to the format approach, there is a radio ad copy that have a function to describing some information and usually used for public service ads. What is the name of that radio ad copy?
A.	Humor
B.	Direct Selling / Description
C.	Testimonial
D.	Educational
Answer» E.