Answer: D
It reveals how the sculptor was ridiculing Ozymandias as he made the statue, and that Ozymandius himself caused his own despair (And facial expression was "mocked"
Step-by-step explanation:
In the poet, it stated the words
"The hand that mocked them, and the heart that fed;"
Implying that it was being mocked
"further detail" if you read above that line in the poet, the frown, lip, and sneer were mentioned, And, if you don't know a (Sneer, is a type of mocking or cunning smile)
Hope this helped-(Ps Yourstruly Yurio&Chyna)