The correct answer is D) A long splice is used to connect two lines that will pass through narrow openings. A long splice is used to permanently join two lines together in a way that does not increase the overall diameter of the joined lines. This allows the spliced line to pass through small openings or blocks more easily. In contrast, a back splice is used to create a permanent loop at the end of a line, and a short splice is used to temporarily join two lines together. The other options are incorrect because A) you would splice against the lay of the line when splicing fiber rope, and B) and C) do not accurately describe the purpose and use of the different splice types.