What Action Did the Spanish Colonial Government Take in Response

What action did the Spanish colonial government take in response to the widespread death of Native Americans due to disease, malnutrition, and inhumane treatment?

A) enacted major social reforms that greatly altered the colonial system
B) imported slaves from Africa to take the place of the dead
C) left their colonies in Middle and South America to found new ones in the Pacific
D) eliminated colonial policies that were causing these deaths