Answer:
D.The audience knows the boastful king's power did not last.
Step-by-step explanation:
Despite the boast of the king, "My name is Ozymandias, king of kings: Look on my works, ye Mighty, and despair!", the works of his hands that he was referring to has become ugly and lifeless and has undergone a colossal wreck. The audience knows this, and this is evident from his words, "Nothing beside remains. Round the decay Of that colossal wreck, boundless and bare The lone and level sands stretch far away."
According to the traveler, the stone sand that the king boasted about now has a shattered and unappealing appearance. ".. Near them, on the sand, Half sunk, a shattered visage [face] lies, whose frown, And wrinkled lip, and sneer of cold command". This is an evidence that the king's power did not have a lasting effect.