Which sentence correctly uses a hyphen?

The teacher was much-loved. (Not this one)

The determined-talented band played. (Not this one)

The strawberries were chocolate-covered.

The well-known artist arrived. (This is what I think it is)

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.