The best explanation for the lack of growth in the Pacific states was that its have a higher cost of living than the states further inland.
Geographically, the Pacific Coast means the western North America which possesses a two unifying geologic and geographic properties which includes the Pacific Ocean - constitutes a natural western border and the coastal mountain - ranges that form the eastern border of the region.
As widely accepted, the Pacific Coast is defined as comprising the U.S. states of California, Oregon, Washington, and Alaska and the Canadian province of British Columbia, Hawaii etc. Therefore, the Option B is correct.
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Producing agriculture past the area of the fourth ring would lead to famine.
B.
Producing agriculture past the area of the fourth ring would not be accessible to the railroad.
C.
Producing agriculture past the area of the fourth ring would not be profitable.
D.
Producing agriculture past the area of the fourth ring would be too dangerous.
the answer to this is C.
A glacier that covers a wide area is called a continental glacier.
Hope this helps.