What Was a Factor in the Increasing Involvement of Old

What was a factor in the increasing involvement of Old Northwest farmers in the market economy?

A) The best cotton-growing land was along the banks of the Erie Canal.
B) The steel plow and the reaper were replaced by newer, more efficient technologies.
C) Farmers no longer needed to rely on eastern banks as a source of credit and loans.
D) A new ethos of self-sufficiency inspired more and more farmers to claim land in the Old Northwest.
E) Loans originating with eastern banks and insurance companies financed the acquisition of land and supplies.