The most common is Chicago style.
The correct answer is : The well-known artist arrived.
"well-known" is a compound modifier and, in the sentence above, is used immediately before the noun it modifies. For that reason, it must be hyphenated.
"chocolate-covered" could be hyphenated as well, but its location in the structure is improper for that use, since it comes after the noun it modifies.
B. Metaphor
It is describing the world as something it isn't really.
Answer: Modify your own claim to reflect the new information.
