Bill Tells Ray That He Can Swim in Bill's Lake

Bill tells Ray that he can swim in Bill's lake whenever he wants.Ray swims Bill's lake several times over the course of five years.Bill then decides that he does not want Ray to swim in the lake anymore.Bill​ 

A)  ​can withdraw the license he gave Ray. 
B)  ​cannot withdraw the license he gave Ray because it has been more than three years since he gave it. 
C)  ​must obtain a court order to stop Ray from swimming. 
D)  ​must notify Ray of his decision in writing and continue to allow Ray to swim for sixty days.