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The justices must
_18_doubts about the court’s legitimacy by making themselves accountable to the code of conduct.18. [A]suppress [B]exploit [C]address [D]ignore
The answer is C, but I do not know what's the meaning of address here.
I think A is reasonable in the meaning.
Dictionaries will tell you: To direct the efforts or attention of (oneself)
So in this case
The justices has to make sure they behave to avoid any doubts about the legitimacy of the court
