A. in the palaces of chinese emperors
The type of poetic form of this excerpt from Robert Frost's "Mending Wall" is a free verse poem (A).
The word <em>quickly </em>describes the verb, or the way in which the line is moving. This means that this word is an B. adverb.
A would be - is long, is moving
C would be - long
There are no prepositions here.