Most recovering heroin addicts seek to be free /of drug dependency and other's prejudicial treatment as well/
a,
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

why A is wrong?, Pls,help

I do not know how to underline the part of sentence, pls, tell.