D; It was from the Gadsen purchase
Francesco de Melzi was an Italian painter...He was basically Leonardo Da Vinci's favorite student and life companion.
The North America is the continent that has the largest area with a low Human Development Index.
<h3>What is a Human Development Index?</h3>
This index refers to the composite measure of a country's average achievements in three basic aspects of human development that is, including the health, knowledge and standard of living.
That means the index capture 3 key dimensions of human development which includes citizens' long and healthy life, access to knowledge and a decent standard of living.
Based on the map, the North America is the continent that has the largest area with a low Human Development Index.
Therefore, the Option D is correct.
Read more about HDI
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Let us choose Extra study. Knowing that opportunity cost is related to the opportunities lost by choosing one specific course of events than others. By choosing an extra study and spend hours studying something, my opportunity cost will be the school sports practice hours that could be spent in this time. Another opportunity cost would be the social interaction, in a club, for example, lost because of the extra study decision.