The Natural boundary is the type of border that shows the division between Haiti and the Dominican Republic.
What is a Natural boundary?
It refers to the boundary that is corresponding to the position of a designated natural feature as it exists at that instant and the boundary position changes with the natural movements of the feature.
Hence, in the America continent map, the Natural boundary is the type of border that shows the division between Haiti and the Dominican Republic.
Therefore, the Option B is correct.
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