Answer:
The correct answer is A. Political boundaries are territory lines on maps that define the boundaries of nations or states.
Step-by-step explanation:
A political boundary is a space of varying thickness, from a imaginary line to a particular space, separating or joining two territories, in particular two sovereign states. The functions of a political boundary can vary greatly according to regions and periods. Between the countries of the Schengen area, it is only a political and legal limit which does not obstruct the movement of people and goods, whereas between the two Koreas, it is materialized by a broad band monitored militarily and its crossing is very limited.