Who were the conquistadors and why did spain send them to the americas

Conquistadors is a term used to refer to the soldiers and explorers of the Spanish Empire or the Portuguese Empire in a general sense. During the Age of Discovery, conquistadors sailed beyond Europe to the Americas, Oceania, Africa and Asia, conquering territory and opening trade routes. They colonized much of the world for Spain and Portugal in the 16th, 17th and 18th centuries. 

The answer is d.  the north had organized schools, whereas the south had few organized schools.