Which of the following was an obstacle to calling the Council of Trent?

The Council of Trent, which was one of the Roman Catholic Church's most important ecumenical councils, convened between 1545 and 1563. Several obstacles delayed its calling:

1. Political Tensions: The political climate of Europe in the 16th century was fraught with tensions between various states and between the Papacy and the Holy Roman Empire. Charles V, the Holy Roman Emperor, had his own territorial interests and conflicts with the French and the Ottoman Empire, which affected his ability to support or participate in a council. The Pope, similarly, needed to navigate these political waters carefully to maintain the Church's influence.

2. Religious Conflicts: The Protestant Reformation, begun by Martin Luther in 1517, had caused significant unrest and division within Christendom. This division created a disruptive environment where it was difficult to find common ground necessary for calling a council. Furthermore, the Catholic Church was initially hesitant to give any ground to the reformers or to acknowledge the need for its own reform.

3. Fear of Conciliarism: Following the councils of Constance (1414–1418) and Basel (1431–1449), there was a concern within the Papacy about the conciliar movement, which suggested that a council could have authority over the Pope. Popes were wary of calling a council that might seek to diminish papal authority.

4. Papal Secular Priorities: Popes during the early 16th century, like Leo X and Clement VII, were often more concerned with politics and secular power than with addressing theological disputes and calls for reform within the Church.

5. Difficulties in Communication and Travel: Practical logistics also posed problems for convening a council. In the 16th century, travel across Europe was slow and dangerous, and communication was laborious. Gathering representatives from across Christendom in one location was no small feat.

6. Timing and Location: There were debates over when and where the council should be held. Protestant leaders, for example, preferred a location within German territories, while the Pope leaned toward Italian cities, eventually settling on Trent.

7. Disagreement on the Scope and Purpose: There was also controversy over what the council should address. While the Church recognized the need to clarify doctrines and address abuses, there were varying opinions on how comprehensive the council's scope should be and whether it should attempt to reconcile with Protestants or merely strengthen Catholic doctrine.

Despite these obstacles, the Council of Trent was eventually convened and played a crucial role in the Counter-Reformation, leading to significant Catholic theological clarification and reforms in church practice.