An Airline Traveler Discovers That the Passenger in the Seat

An airline traveler discovers that the passenger in the seat next to hers paid 70% of the price she paid for her ticket.Is this a violation of the Robinson-Patman Act on the part of the airline?

A) No,because the traveler only discovered the price difference accidentally.
B) No,because the traveler could have gotten that same fare by booking on a different day.
C) Yes,because all the seats arrive at the same destination,so they should be priced equally.
D) Yes,because the other passenger's discount must have been negotiated illegally.
E) Yes,because any difference in the fares must be based on the location of the seat on the plane.