D- inflation would not increase the farmers debt, but (unless the debt is adjusted for inflation) the debt would decrease - this is not a correct answer.
Inflation is the decrease of the value of money (but the value of objects and services stays the same - it increases with the respect to the value of the money. Because of this neither the manufactured goods nor the farm machinery would be cheaper- but the increase of crop prizes would take place (so answer a), and that's why farmers favour it.
The Sumerians which was an ancient civilization from Mesopotamia were believed to be the first people to make and use a wheel. This invention is vital to many conveniences we have today :)<span />
