Which of the following best describes ecclesiastic matters?

Ecclesiastic matters refer to issues or topics that pertain to the church or religious institutions. Therefore, the best descriptor for ecclesiastic matters is religious. This term encompasses everything related to the practices, governance, and beliefs of religious organizations, making it the most accurate choice in the context provided.

While terms like secular and worldly may invoke a sense of contrast to religious elements, they do not accurately encapsulate the characteristics of ecclesiastic subjects. Temporal, on the other hand, suggests a relationship with time or earthly concerns, which again diverges from the spiritual and doctrinal focus associated with ecclesiastic matters. In summary, "religious" aptly captures the essence of ecclesiastic concerns, highlighting their foundational connection to faith and religious practice.