Final answer:
Jefferson's farming invention was called the Mouldboard, a tool to more efficiently dig the sod that required only one or two mules to pull. The correct option is E.
Step-by-step explanation:
The farming invention by Jefferson is known as the Mouldboard of least resistance. This agricultural tool was designed to dig the sod deeper and more efficiently, and only required one or two mules to pull it.
This was an important development in agricultural technology, making plowing fields easier and more effective compared to the older, heavier plows.
The Mouldboard played a significant role in early American agriculture by enabling farmers to till the land more quickly and with less animal power.
It exemplifies the broader trend of innovation in agricultural techniques, which also saw the development of crop rotation systems, draught horses replacing oxen, and eventually, the spread of the railroad to bring supplies and new farm machinery to rural areas. Option E. is the correct one.