In the early 1800s, farmers did not use metal plows because:
a) the plows were not available yet
b) the farmers believed the metal would contaminate the soil
c) the plows were too expensive for most to afford
d) the farmers had other methods that were more efficient

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.

1. the spread of reform movements aimed at perfecting american society

The correct answer is b