The "Onboard,online Retail Business" Refers to

The "onboard,online retail business" refers to

A) the options airlines offer passengers to upgrade their seat to first class.
B) the options airlines offer passengers to change their destination.
C) the options airlines offer passengers to connect to Facebook and Twitter.
D) the options airlines offer passengers to shop through their mobile devices while they fly toward their destination.
E) the options airlines offer passengers to purchase food and beverages while on their flight.