Correct option is D
The given highlighted phrase is incorrect because we need noun ‘significance’ here after ‘the’ therefore option (c) is also incorrect. We use ‘neither’ as a conjunction with ‘nor’ hence option (a) is incorrect. Option (b) is incorrect, because neither/nor are conjunctions that connect two parts of a sentence to each other. They must be used in parallel structures; i.e., both sides must be balanced.