This map combines a satellite view with a standard map outline to show the state of New Hampshire.
Judging by the image, which border is likely to be mostly a natural one?
 

Explanation

The border between New Hampshire and Maine is almost completely straight for most of its length. That means it’s probably an artificial border. The same can be said for the border with Maryland. That means Choices (B) and (C) are wrong. However, the border with Vermont is irregular, and a close look at the map tells you that the Connecticut River runs along that line. This boundary is a natural border following the Connecticut River. The correct answer is Choice (A).
 

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