The correct order of rate of operation of genetic drift in the following population (represented by circle as their size) is ?

(1)	A > B > C > D
(2)	D > B > C > A
(3)	D > C > A > B
(4)	A > B > C = D

@ harini 
option no a turns out to be the correct option here , 
as the small circle will be more preferrable if we can compare the gentic drift , 
small circle means the species will move into a small diversity of area , and so, they have more operation to genetic drift . 
HOPE IT CLEARS