Concurrent powers are powers<span> in nations with a federal system of government that are shared by both the federal government and each constituent political unit such as a state or provence</span>
Answer: A, I think it's congressional members.
Explanation: It would not make sense for a presidential candidate to put pressure on himself nor the citizens.
D is the answer please comment telling me if it was right
Answer:
Their challenges were mostly geographical, such as farming and traveling on mountains or wetlands, while a majority of ours are caused by humans damaging the Earth, such as pollution, deforestation and overhunting