I dont agree with your answers.
to dispose of
- is the idiom
disposing of - phrasal verb
disposing - transitive verb
Let us get rid of "or servicing"
in the sentence and see how it looks
anyone disposing of refrigerators must capture the chlorofluorocarbons in the refrigerant chemicals.
The construction in(A) is least parallel
take a look at
look at the following sentence taken from environmental protection agency
We all share responsibility in helping to reduce ozone destruction by disposing of
appliances properly. You can help by thinking about refrigerant recovery before arranging for pickup or disposal of your used appliances.
The bold portion here is phrasal verb.
This Q is from 885SC and there are some typos in many questions and some have wrong answers as well.
OA need not be correct always.