How are Canadian and U.S.populations similar? 

A)  Both nations are NOT affluent. 
B)  Both nations have the same type of political system. 
C)  Both nations have limited access to birth control. 
D)  Both nations are identical in terms of urbanization.

Both Canada and the U.S. are highly urbanized countries with the majority of their populations living in urban areas. The other options are incorrect; Canada and the U.S. are both considered affluent nations, they have different political systems (Canada being a parliamentary democracy while the U.S. is a presidential republic), and both countries have access to a range of birth control options.