The Olympus Eye Trek Is a Device Which Provides "A

The Olympus Eye Trek is a device which provides "a high-quality personal TV experience." It resembles a pair of glasses and when worn makes the user think he or she is watching a 52-inch television. An ad for the device contains both a telephone number that can be called and a website that can be visited for further information on how the gadget works. This gadget is most likely high in:

A) user friendliness.
B) complexity.
C) risk.
D) synergy.