A politician is a person involved in politics. A current politician does necessarily hold a position, and can e.g. just work in information and information collection, revising law-documents or collecting funding. A politician will most typically be involved in a political party.
A diplomat is officially appointed by a state or organisation to oficially represent this state or organisation in different kinds of negotiations and protection of interests. Diplomats are expected to be neutral and not show party favoritism. <span />
I believe the answer to your question is B. If the United States was to be partitioned in the same way India was, the partition would be based on religious groupings. Hope this helped!