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

you will need these

an outline of all three paragraphsan identification of the historical era that you are writing aboutan explanation of the term mass productiona description of two ways new technology affected industrya conclusion that shows how new technologies allowed industrialization to grow