<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the one having to do with the fact the agricultural in the South was booming, and slaves were needed to tend the fields and work the land. </span></span>
Basically, people who are educated leave the country going towards places like Europe or the Americas. This leaves the country without educated people and the country can't develop which ruins its economy in turn because there's nobody to improve things and help build the country and its economy. These people go to other countries and help there.
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The correct answer is D. Commercial industry.
Explanation
A production system is a term to refer to a set of operations that allow the manufacture of an object or the provision of a service. In general, companies have a production system to become more efficient and provide the best service to their users, an example of this is the commercial industry that is characterized by focusing on mass production to constantly supply the demand of its goods and thus earn money, this is because when it is produced in mass, everything is usually cheaper this includes labor, materials and the use of machinery. So, the correct answer is D. Commercial Industry.