The film "Gone With The Wind“,_____the 2nd world War,is popu

The film "Gone With The Wind“,_____the 2nd world War,is popularis popular a
The film “Gone With The Wind” ,_______the 2nd  world War,is popular at present all over the world.
A.was based on      B.based on            C.which was based on  D.both B and C
why?