Based on the wording of the question, my vote is for “Total Depravity”. Though the Reformation began with a controversy over indulgences (95 Theses) and man’s ability to buy his salvation..this led to the question...How is One Saved..? This question naturally led to the man’s spiritual condition and the related question of “free will”. Thus you have Erasmus writing “On Free Will” and Luther’s The Bondage of the Will”.

Dave