Why were many analysts worried about the fall of stable authoritarian regimes during the "Arab Spring?"

a. It was believed that access to the region's oil reserves would be curtailed.
b. Analysts worried populist radical anti-western governments would take power.
c. Scholars grew concerned that such events might threaten stable democratic regimes in sub-Saharan Africaand southern Europe

d. Many believed that this could set back economic development in the region by decades.

b