To conclude is to have enough information to make a conclusion
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.
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Graphics are pictures that E further illustrate a process and are F functional. These help you solve technical directions. Like putting furniture together. The pictures go along with the directions to help you build it.