Final answer:
Missiology is the academic study of missionary theory and strategy, examining the methods and historical context of Christian mission work.
Step-by-step explanation:
The term missiology is best defined by the following: d) The study of missionary theory and strategy. Missiology encompasses the disciplined study of the practices, purposes, and history of Christian missions around the world. It delves into the methodologies used to spread Christianity, examines how the Gospel is communicated across various cultures, and often includes the analysis of religious, social, and historical contexts that affect missionary work. Missiology focuses on understanding the principles and practices behind missions and missionary work. It involves studying the methods and approaches used in spreading religious beliefs and incorporating new peoples into a particular religious community.