The issues that caused sectionalism to develop were: economic political geographical all of the above

I would say all of the above. Political because there may be tension between individuals, economic because it may have been that one part of the gov't didn't want to take on the other parts debts, and geographical like in the case of Greece where civilizations literally had an ocean between them. 

the correct answer is d: "party organizers, volunteers, voters, and elected officials."

party organizers: individuals responsible for designing strategies in order to better execute the political campaign. this includes the candidate's public relations. volunteers: individuals responsible for raising awareness regarding the candidates running for office.voters: individuals who are convinced by volunteers that a particular candidate is the best option.elected officials: winning candidate and his elected team are a product of a successful political campaign.