Answer:
D
Explanation:
Diocletian was correct, the empire was too large to be ruled by a single man and needed at least 2 emperors to control both the East and Western half, the Eastern half had enemies such as the Sassanids and Balkan tribes to deal with while the Western half had Germanic Incursions to deal with
D settle in one place, they could then properly sustain themselves :)
The correct answer to fill in the blank is the Calvinist(Huguenots)
hope this help and is what your looking for.