The Roman Empire started to deteriorate because in the years after Augustus, few Roman emperors were efficient rulers; most were mad, greedy, or both, and also many died as a result of exposure to diseases from other lands.
Political corruption, wastage of money on unnecessary things, and passion for ladies (prostitutes) drove them to spend a lot of money because of which the Roman Empire began to decline in 200 AD.
In addition, the Roman Empire's economic growth slowed as the Romans loosened their gold-exporting policies.
Emperors were less regarded with the rise of Christianity throughout the Empire, and this gradually declined their powers over the people. The Roman Empire finally collapsed in 476 AD.
Hence, Option B. Very few Roman emperors in the centuries after Augustus were competent rulers; most were insane, greedy, or both & option C. Exposure to diseases from other lands killed many Romans are correct.
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