The two ideas of total war was used because the countries against each other where angry with each other and It was one of the deadliest conflicts in history and precipitated major political change, including the Revolutions of 1917–1923 in many of the nations involved. Unresolved rivalries at the end of the conflict contributed to the start of the Second World War twenty-one years later. They wanted to end conflict. The second reason was that each country wanted more power. It was a "war to end all wars" But it never ended all wars since World War II Came around the corner twenty-one years later.
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~Hope this helps
I think the answer is True but I’m not 100% sure
The statements that true is C. Salt was so valuable in Ghana that it was Worth in Gold
Many said that the Ghana empire was rich by handling the trade of Salt and Gold. There are no record about option A and option B.
And Option D. is definitely wrong because the Ghana Empire use Silent Trading, the trading occurred without the traders seeing each other face
False. That would be the area. Also, please change the subject from History to Mathematics.