What was a negative impact of “bonanza” farms?
a. output declined.
b. farms got smaller.
c. farms became disorganized.
d. oversupply led to lower prices

One negative impact of “bonanza” farms was that "d. Oversupply led to lower prices". Farmers flooded the market with products which made competition harder and led to poor conditions for not only the community but the farmers themselves. 

The theory is land mass basically what they said.