Which splice allows two three-strand lines to be permanently joined while maintaining nearly the original rope diameter, permitting the line to still render through a sheave?

Why D is correct

NAVEDTRA 14067 §3-3 describes the long splice as joining two lines while keeping nearly the original diameter so the line still renders through a sheave, at the cost of some strength and more rope. The short splice creates a thickened section that will not pass through a block.