Answer:
C. Because social media sites can spread information quickly and easily
Step-by-step explanation:
A hoax is effective to be carried on sites like Twitter because besides of the answer given they are a form of impersonal communication.
This type of communication requires less to none direct methods and allowed people to make statements that may not make if another person is in front of them. By not knowing who is the source of the hoax and the constant repetition of it, it is very difficult to deny something that has already been said in social media.
I hope the answer and explanation are correct.