Ellen's Driveway Is Actually on Richard's Land,but Ellen Has Used

Multiple Choice

Ellen's driveway is actually on Richard's land,but Ellen has used it for 20 years with no complaint from Richard.When Richard sells his house,a survey shows the problem and the new owner demands that Ellen abandon use of the driveway.Will she have to move her driveway?

A) Yes,since Richard is selling the land that the driveway is on
B) Yes,since it is not in her deed
C) Not if she used it continuously
D) Not if she got permission from Richard