One of the sentences below is correctly marked to show the prepositional phrase, the preposition,?

... and its object. Which sentence is correctly marked? Hint: The prepositional phrase is in parentheses. The preposition is in bold text. The object of the preposition is in italics.

(He came) over the hill and through (the garden).
He came (over the hill) and (through the garden).
He (came over the hill) and (through the garden).
He (cameover) the hill and through the garden.
please help