Well, when you find gold you get rich... therefore they went for it! Hope i helped(:
I believe the answer is theoretical model
A theoretical model is the foundation that could be held to support a certain theory for a certain research or study.
From the example above, the study is build on a foundation that both behavior and environmental factor could affect the subjects' overall health
I believe B) Defensive and possibly C) Submissive behaviors
It creates the need for natural resources
It created a demand for larger markets in which to sell the surplus slave labor
It created new agricultural techniques that required Europe to find farmable land overseas
