Questions Refer to the Maps Below

Questions refer to the maps below.
Russian Expansion, 1801-1914 U.S. and Canadian Westward Expansion, 1803-1912
-What can the two maps reveal about the level of industrialization in North America and Russia?

A) They reveal very little, since the maps do not show the location of mines or factories.
B) North America relied on vast natural resources to develop its industrial might.
C) The lack of trade routes implies that both Russia and North America had to be self-reliant.
D) The density of the railway systems implies that Russia was less industrialized than the United States.