Which of the following most directly contributed to the surge of witch trials in the early modern period?

While the encounter with the New World and its religious practices did have some impact on European thought, it was not a direct contributor to the witch trials. The trials were primarily rooted in European socio-political and religious contexts rather than the influence of indigenous beliefs, which were largely marginalized.

The Crusades, while significant in shaping medieval European society, had largely concluded by the time the witch trials surged in the early modern period. Their failure did not directly incite witch hunts; rather, it was the internal religious conflicts and societal changes that played a more direct role in fostering witch trials.

The spread of diseases like smallpox caused significant suffering and fear, but they were not directly responsible for the witch trials. The trials were more closely connected to religious conflict and societal strife, which were reactions to the turmoil of the Reformation era rather than health crises.

The Ottoman conquests indeed created a climate of fear in Europe, but they did not directly lead to the witch trials. The trials were primarily a manifestation of internal European religious conflicts rather than external threats, which often led to different forms of societal reaction.