Population is all animals of the same species living in a certain area; a community is different species living in a certain area.
Comparative advantage refers to the ability of a party to produce a particular good or service at a lower opportunity cost than another. Even if one country has an absolute advantage in producing all goods, different countries could still have different comparative advantages
The answer you want here is Vegetation and climate
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C and D are likely correct.
High interest rates would likely dissuade people from using credit cards and would likely move them back to using their debit cards for purchases and to keep credit card purchases to ones that they knew they could pay back. You would end up getting people who were more desperate for the line of credit using it.