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.
The answer would be c - interjection. Interjections are words or phrases that express emotion. Examples would be wow, awesome, ummm, etc. These are not appropriate for formal writing but used constantly in daily communication.
Answer: The source is not relevant
Explanation: