Identify the underlined element in the following passage from the novel Bleak House by Charles Dickens.
 "Fog everywhere. Fog flowing up the river, among green banks and meadows; fog rolling down the river, where it hangs defiled among the
 ships and buildings of a great and dirty) city." (5 points)
 a
 Prepositional phrase
 Ob
 Absolute phrase
 Ос
 Infinitive phrase
 Od
 Sentence fragment