Which conclusion about the U. S. economy is most supported by the information on this time line?

Marketplace competition drove producers to innovate and improve products.

Marketplace competition drove producers to innovate and improve products.

a best description that resulted a division among labor in the early farming communities in their period was there was a change in their society in terms of having social roles to develop and change that led complications and divisions in the society.

either d or b, i'm not to sure. but my gut tells me it's prob going to be b