The Olmec civilization’s economy was based on the sharing of resources. trade with other civilizations. the use of currency to buy goods. available resources and bartering.

I believe it's bartering. or letter D

Explanation:

The Olmec used wood and rubber from trees as well as mineral resources to make goods. Minerals are things like stone that come from the earth. People also bartered or traded resources and goods. They did not use money like we do today. Examples of things the Olmec made and bartered with include clay pottery,  They also made clay sculptures and masks.  STARIGHT FROM NOTES

the process is called revolution because it was a process of great economic-social transformations that began in england in the xviii century.

the industrial mode of production spread throughout much of the northern hemisphere throughout the xix and early xx centuries.

the effect of this revolution was the distance between the countries, with respect to economic and political power.   after all, not all industrialized at the same time, remaining in the condition of suppliers of raw materials and agricultural products to the industrialized countries.

these differences mark to this day the nations of the world that are divided between developed and developing countries. one way to measure whether a country is advanced is to assess how industrialized it is.