Classify the two underlined parts of the sentence by the type of phrase or clause each is.

Venice became the center of glasswork after the Dark Ages.

A.
of glasswork: adjective phrase
after the Dark Ages: adverb clause
B.
of glasswork: adjective clause
after the Dark Ages: adverb clause
C.
of glasswork: adverb phrase
after the Dark Ages: adverb clause
D.
of glasswork: adjective phrase
after the Dark Ages: adverb phrase