Answer:
C
Explanation:
Location of major rivers or large lakes,
Boundaries between counties and states
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B: China and India both have a population around 1.5 billion people so in total they have around 3 billion people combined! That is more than the continent of Africa and North America combined!
It could be because India Is one of the most populated places so 12 in India doesn't seem that much there but if those numbers of people came to a country with a lower population it would be a higher percentage. if that makes sense..