Which factor most contributed to the decline of Rome? A.
over-reliance on troops recruited from non-Roman peoples
B.
the decay of Roman engineering skills
с.
changing patterns of trade
D
climate change

the correct answer that would best complete the given statement above would be option b. expanding civil services. diocletian and constantine paved the way for foreign invasion by dividing the empire, creating administrative bureaucracies and reorganizing the military, except for expanding civil services. hope this answer .

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explanation:

ayatollah khomeini can best be described as the leader who declared iran to be an islamic republic.