Final answer:
The chapter is about historical events in Medieval Christian Europe.
Step-by-step explanation:
The subject of the question is History and the grade level is High School.
The answer key with the numbers from 1 to 17 provided refers to a chapter in a history textbook. The content of this chapter is focused on Medieval Christian Europe and includes topics such as the Latin Church, the Papacy, the characteristics of Medieval Christianity, the feudal system, Anglo-Saxon England, France, invaders, and the Vikings.
Therefore, the answer to this question is C. Historical events.