The correct option is C Differences of the opinion about how marginalized sections are to be treated.
Democracies have successfully eliminated differences of the opinion about how marginalized sections are to be treated. It is one the basic feature of democracy that all the decisions are taken through negotiations and discussions. It is because of the discussion only that various ideas are produced and the idea which is highly favoured is selected. Thus, the negotiations help in avoiding differences of the opinion relating to any particular problem.