Natural boundaries are created when physical geographic elements, such as mountains or rivers, are used to separate or demarcate two political borders.
The boundaries that naturally separate two distinct zones or states, functioning as the political boundary, are what is referred to as the natural boundary.
Thus, Option A is correct.
What does the term "natural boundary" mean?
Natural Boundary refers to a boundary that, at any given time, corresponds to the position of a specified natural feature as it is at that time, and that changes in accordance with the feature's natural movements, provided that those movements are gradual and undetectable from moment to moment.
Borders can occasionally be drawn along a natural boundary, such as a river or a mountain range. For instance, the Pyrenees' crest serves as the border between France and Spain. The border between the United States and Mexico follows the Rio Grande for a portion of its length.
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