The uncertainty of church authority, mentioned in Source 2, most directly contributed to which of the following European developments in the 13th and 14th centuries? The Crusades

The Protestant Reformation

The Counter-Reformation

The Enlightenment

Source 2

"Throughout the twelfth century there were many signs that the European intelligence was recovering courage and leisure, and preparing to take up again the intellectual enterprises of the first Greek scientific enquiries and such speculations as those of the Italian Lucretius. The causes of this revival were many and complex. The suppression of private war, the higher standards of comfort and security that followed the crusades, and the stimulation of men’s minds by the experiences of these expeditions were no doubt necessary preliminary conditions. Trade was reviving; cities were recovering ease and safety; the standard of education was arising in the church and spreading among laymen. The thirteenth and fourteenth centuries were a period of growing, independent or quasi-independent cities; Venice, Florence, Genoa, Lisbon, Paris, Bruges, London, Antwerp, Hamburg, Nuremberg, Novgorod, Wisby and Bergen for example. They were all trading cities with many travellers, and where men trade and travel they talk and think. The polemics of the Popes and princes . . . were exciting men to doubt the authority of the church. . . .

The Arabs [began] restoring Aristotle to Europe, and . . . [European princes like] Frederick II acted as a channel through which Arabic philosophy and science played upon the renascent European mind.”

H. G. Wells, A Short History of the World, 1922