Which statement does not describe a reason for the decline of the Roman Empire?
A.
Budget deficits caused by low taxes on Roman citizens led to increased public debt and helped topple the central government.
B.
A series of brutal and incompetent emperors squandered huge sums and led to public disgust with the imperial government.
C.
Germanic tribes, Parthians, and North Africans pressed attacks against the empire's frontiers from all sides.
D.
Roman troops returning from the Middle East brought a plague into the capital that killed up to 10 percent of the city's population.