One Controversial Patent Granted to Google in 2013 Is for "____

Multiple Choice

One controversial patent granted to Google in 2013 is for "____" advertising-a business model for charging advertisers according to the number of views an ad receives via a "head mounted gaze tracking device" (speculated to be Google Glass) .

A) pay-to-look
B) pay-for-play
C) pay-for-gaze
D) pay-to-view