A.Directly proportional to d
B.Directly proportional to d2
C.Directly proportional to d3
D.Directly proportional to d3/2
E.Directly proportional to d4
A.Directly proportional to d
B.Directly proportional to d2
C.Directly proportional to d3
D.Directly proportional to d3/2
E.Directly proportional to d4