Which type of map is most likely to focus on boundaries between countries, states, and counties?

Political map

Explanation:

A political map is most likely to focus on boundary lines. Topographic, physical, and geologic maps may show boundaries, but these boundaries aren't usually the focus of the map.

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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.