B can be eliminated because them can be for artisans or the creations, it is not clear here.
In A, due to modifier which, it sounds like the flowers are carved only on cornices.
D, E change the meaning of the sentence.
Hence, C should be the answer.
In A, due to modifier which, it sounds like the flowers are carved only on cornices.
D, E change the meaning of the sentence.
Hence, C should be the answer.






