53.

Answer and Explanation

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.