D. All of the above (if this isn’t correct I apologize)
<span>There are such great differences in the wages and salaries paid to different people because a worker's human capital is the greatest determinant of his or her wage or salary. Each person's human capital is valued according to the amount of education and training that person had throughout their life. So it is only natural that a person with two PhDs should have a higher salary that those who've only finished high school. </span>
One piece of information that the geographer might be able to convey more clearly than the economic historian would be exactly how geographic features such as mountains and lakes influenced the rise of certain societies.
<span>The Tokugawa shogunate was the dynasty created after Leyasu Tokugawa defeated warlords and united Japan under just one rule. Therefore the answer would be B. </span>