Ease of SN1 reactions among these compounds upon treatment with aq. NaOH will be in the order as:
a) Iodoethane > Chloroethane > Bromoethane
b) Bromoethane > Chloroethane > Iodoethane
c) Chloroethane > Iodoethane > Bromoethane
d) Bromoethane > Iodoethane > Chloroethane