What is the purpose of the radio public service announcement on "Make A Difference Day"?

It's purpose is to promote the "Make A Difference Day" program which encourages people to make a difference, together! It has been used as a tool to make announcement, create instructions, promote awareness and calls for an action to be done in relation to the programs vision.

A) To instruct

B) to call to action

C) To entertain the reader

D) to support an argument

The answer is B) to call to action