The Crisis of the Third Century another name is Military Anarchy it refers to specifically an invasion of Germanic tribes into the Roman Empire. Thus, option (a) is correct.
What is crises?
A crisis is an unanticipated and unknowable risk to a firm, family, state, or country. Without warning, crises can happen at any time. Disaster crises, natural crises, accidental crises, etc. are a few examples of several types of crises.
Germanic tribes fought the Roman Empire during the third century AD 235-284, causing crises that decimated both the population and the economy. The crises are causing issues including plagues, war, foreign invasion, and economic slump.
Therefore, option (a) an invasion of Germanic tribes into the Roman Empires correct.
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