One thing I haven’t seen smart phones do yet: Figure out that you’re in a restaurant, then let you order your meal straight from your phone without talking to a server.  To cut transactions costs further, your phone would tell the restaurant where you’re sitting using GPS.

How long will it be before 50% of U.S. restaurants handle orders this way?

A. 3 years
B. 10 years
C. 30 years
D. Never

Please show your work.