The two most popular religions in medieval Spain that competed for political power were option C. Christianity and Islam.
political power, can be described as the power of any state with any particular structural organization which is been gotten from the subjects of the state.
In this case, it should be noted that The two most popular religions in medieval Spain that competed for political power were Christianity and Islam because Power politics prioritizes national self-interest compare to the international community, and it can threatening one another with military.
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