Select all the correct answers. Im pretty sure its only d but not Which two factors explain why salt was so valuable to West Africans?

#Salt helped prevent dehydration in the hot climate.

#Salt was used as a form of currency.

#Salt was one of the exotic goods traded by the Asian traders.

#Salt was used to preserve food.

#Salt was available only in Zimbabwe.

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d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.  

answer; the trial de novo