I think that the most correct one is B. Disease and civil war ravaged the Inca Empire. They didn't have conditions to protect from heavy diseases
The Great Leap Forward, intended to be a five-year effort, was halted in 1960 after three brutal years. The initiative is said to have cost an estimated 20 to 48 million lives as a result of catastrophic economic policy, compounded by adverse weather conditions including a flood that killed 2 million people and the subsequent crop failures that led to starvation. In addition to the fatalities, the Great Leap Forward had negative environmental impacts as communes were encouraged to set up "backyard" production plants for needed supplies such as steel, timber and cement. In 1960, an extensive drought further added to the country's troubles.
the gas is carbon-dioxide....
The map shows that they that very little independence and power
The Silk Road was important because it helped to generate trade and commerce between a number of different kingdoms and empires. This helped for ideas, culture, inventions, and unique products to spread across much of the settled world.
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