Query related to SC- Most recovering heroin addicts seek....

Most recovering heroin addicts seek to be free of drug dependency and others' prejudicial treatment as well.

(A) of drug dependency and others' prejudicial treatment as well.
(B) both of drug dependency and also of prejudicial treatment.
(C) both of drug dependency and also from prejudicial treatment.
(D) both of drug dependency but also from prejudicial treatment.
(E) both of drug dependency and of prejudicial treatment as well.

The answer for this SC is 'E', but I am not able to understand
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