D. The geometric boundary between Iraq and Saudi Arabia.
Explanation:
A superimposed boundary can be defined as the boundary imposed on a geographical region or area by a colonizing, conquering or an external power and as a result of this, the preexisting cultural organizations and patterns are completely ignored.
Some examples of a superimposed boundary is the geometric boundary between Iraq and Saudi Arabia, Uganda and Kenya, as well as other boundaries imposed on Africa by the Europeans during the era of colonialism.
