Answer: They worried that dictators would be replaced by extremists.
American leaders were hesitant to support some Arab revolutions because they were worried that dictators would be replaced by extremists.
Extremism is "the quality or state of being extreme" or "the advocacy of extreme measures or views". The term is primarily used in a political or religious sense. These religious dictators beliefs are profound convictions that oppose the fundamental values of society, the laws of democracy and universal human rights by advocating the supremacy of a particular religious group.
Therefore, first option is the correct answer.
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