Answer: D
The answer is D because the information following "message" is the message. A colon is appropriate (as used in D) when the information after the colon describes or represents the word or phrase that comes before the colon.
They are nominated by the President of the United States and confirmed by the senate.
Humans are naturally good. We just do bad stuff. Being evil is taught, not in nature. No person is born evil. They do evil stuff. Most evil things are done with bad intentions. But people can change. People can change from ‘evil’ to good.