Provide an example of how the rise of monarchs led to colonialism

The rise of monarchs led to exploration and ultimately colonialization as the monarchs sought to increase their wealth and that of their nation. An example is Henry the Navigator, a Portuguese prince who was a leading patron of various voyages that led to discovery and ultimately colonization

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.