The "well-field system" Select one: a. was an animistic belief designed to protect the health of the land. b. was originally developed by Aryan invaders to improve agricultural productivity in western China. c. was the first major agricultural advance in ancient China. d. was a water-diversion system which insured that every farm had the amount of water it needed. e. allowed peasants plots cultivated for their own use as well as land cultivated for their lords.

The correct answer will be option-B.

Explanation:

The European- Christopher Columbus discovered the new land in 1492 which was named later America. The Europeans used human labor to conquer the new land by carrying disease, war, and slavery to the new land.

They carried diseases like influenza, smallpox and other viruses to which the native population of America was not immune. This lack of immunity to the old world pathogens leads to the death of about half of the population that is 50,000 to 300,000 people.

Thus, Option-B is the correct answer.