53.
Your Answer is
Correct Answer is A
Explanation
Item A: Use a stone railing as an apposition, and modify railing with the post-supported attributive.
Item B: The front is a complete sentence, and the attributive clause guided by which cannot be separated from the previous sentence by a period.
Item C: The expression of It being is wrong, and being cannot be used as a predicate.
Item D: Use a comma between two complete sentences, wrong.