What events and circumstances led to the rise and fall of the byzantine empire

There were many causes of the decline of the Byzantine Empire. The division and separation of its religion, Orthodox Christianity, with the Catholic Papacy of the west would prove lethal on the long run. The loss of the theme system which provided the empire with immediate military protection in case of invasions. The loss of Asia Minor to the Turks (Asia Minor was the main recruiting ground of the empire). And the Crusades which wound up dismantling the empire.

Your answer would be answer choice c monsoons