I believe the answer you are looking for is B.
Answer:
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Explanation:
I believe the answer would be C, burning fossil fuels. Oil and gas is made up of the remains of microscopic plankton. Over millions of years the remains become the carbon-rich coal, oil and gas we can use as fuel. When fossil fuels are burned they release carbon dioxide into the atmosphere, thus contributes to global warming.
Fifteen years after the collapse of the Soviet Union, "U.S.-Russia relations are clearly headed in the wrong direction," finds an Independent Task Force on U.S. policy toward Russia sponsored by the Council on Foreign Relations. "Contention is crowding out consensus. The very idea of a 'strategic partnership' no longer seems realistic," it concludes.
Answer: Return to normalcy, referring to a return to the way of life before World War I.
Explanation: