The "Fall of Rome" did not happen with one event, but with many. Which of these is NOT a reason for the decline of the Roman Empire.
A: A series of brutal and incompetent emperors squandered huge sums and led to public disgust with the imperial government
B: The Hundred Years War was too long and devastating
C: Waves of smallpox, plague and other diseases brought to Rome from foreign lands ravaged the city
D: The empire expanded to a size that was too large to effectively govern