The answer could be either A. or C. I'm leaning more into C. because scarcity means having short supply of something, and having not enough resources doesn't satisfy all of ones needs.
Hope this helps!
Answer:
solar energy and heat energy
Explanation:
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True this is because when we do something new we have to listen to the speaker so we can learn it
Answer:
B. Unification of the empire
Explanation:
I would pick B. because, in order to have an empire, you need all three of those. D makes no sense because you can't really put those two together. A doesn't really connect either. The only relation is that they have a powerful army.
Hope I helped :)
The primary energy source in the US is fossil fuels, such as coal and oil. Hydroelectic and solar are very very small in comparison (about 10 to 15 times less of those is used than fossil fuels).