Read the following context and choose the best option to answer the question.
Context: The Tourbillon Mechanical Watch compensates for the gravity - induced gain or loss with its mobile carriage . The Tourbillon Mechanical Watch , whose carriage is mounted on one side only , with no supporting bar , allows better visibility through the cutout window at 6 oclock . The watchs face ( and back ) is made of sapphire glass , making it scratch - resistant . The Tourbillon Mechanical Watch is a limited edition .
Question: What may be the reason consumers will buy the watch immediately ?
Options: 
A. The number of these timepieces is restricted .
B. The Toubillon is made of sapphire glass which is now limited .
C. The Tourbillon Mechanical Watch will not be sold after 6 oclock .
D. None of the above choices .


A