Different steps involved ind the mechanism of preparation of sodium hydoxide by Castner process are given bleow .Arrange them in correct sequence .
(i)`2Cl^(-)rarr Cl_2+2e^(-)`
( b) `Na_a Hg-2e^(-)rarr2Na^++Hg`
( c) `2H_2O+2e^(-) rarr H_2+2OH`
(d ) `Hg+2Na^+2bare rarr Na_2HG`
( e)`2NaClrarr2Na^+2Cl`
( f) `2Na^(+)+2OH^(-)rarr2NaOH`
A. e d c b a f
B. e b c a d f
C. d b a e c f
D. e a d b c f