The right term that is used usually to describe a region just beyond or at the edge of a settled area is a <u>Frontier</u>, because in that context, a frontier is a place or imaginary line that limits a region, territory, location, city or a country extension, and where sometimes the frontiers are located further or at the border of a settled area.
D I BELIEVE O GREAT MATH HUMAN
Voters remove elected official through early election.
I believe the answer is B only because suffrage means to vote. But it could also include D so I'm not 100% sure.