Trade helps maintain and expand civilizations by... a. having a good supply or even a surplus of natural and human-made resources, there is a demand for these resources, and trade (barter or use of money) is taking place in order to create a good economy.

b. having a good supply or even a surplus of natural and human-made resources, there is a demand for these resources, and no trade trade (barter or use of money) is taking place in order to create a weak economy.

c. having a good supply or even a surplus of natural and human-made resources, there is not a demand for these resources, so trade (barter or use of money) is not taking place in order to create a good economy.

PLS HELP I need it's due 4:00 pm EST