How Are Fear Appeals Most Effective

How are fear appeals most effective?

A) Fear appeals may be most effective by decreasing the incentive to think carefully about the arguments in the message.
B) Fear appeals are most effective when they include shocking and alarming images.
C) Fear appeals are most effective when they include specific information on how to avoid the threat.
D) Fear appeals are most effective by increasing the ability of already fearful message recipients to carefully process a message.