Final answer:
The annular space of a LOX/LIN transfer hose is typically filled with vacuum insulation, which effectively prevents heat transfer.
Step-by-step explanation:
The correct answer is C) Vacuum insulation. The annular space of a liquid oxygen/liquid nitrogen (LOX/LIN) transfer hose is typically filled with a vacuum insulation. This type of insulation works by creating a vacuum between two layers of material, which greatly reduces heat transfer through conduction or convection.
Vacuum insulation is highly effective at preventing the transfer of heat, making it ideal for applications where maintaining low temperatures is important, such as in the transportation and storage of cryogenic fluids like LOX and LIN.