Under which circumstances might you receive a tax refund from the irs?

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.