The plantation economy in the south produced a. great profits and developed great educational institutions b. great profits at the expense of cultural development and equal opportunity. c. low profits despite the enslavement of a great number of people d. equal opportunity for all whites and no illiteracy

The correct answer is:
B. Great profits at the expense of cultural development and equal opportunity.

Explanation:
Even though the plantation system resulted in huge profits thanks to crops like tobacco and cotton, many Southern states focused solely on this form of labor to make money.
Being focused on only agricultural resulted in limited development of Southern culture.
Along with this, the enslavement of blacks in the South resulted in unequal opportunities for Southern citizens.
Blacks did not have legal, political, or economic rights. Rather, they were viewed as property and treated horribly by their owners. 

Slave labor.  slave labor was an essential part of the economy of spanish polish colonies.