What Aspect of Rome?s Population Size Was a Sign of Its

What aspect of Rome?s population size was a sign of its decline?

A) Declining population as birth rates no longer kept pace with death rates
B) Rising population as Roman expansion led to increasing number of slaves
C) Declining population as religious conversion led to many males choosing celibacy as a way of life
D) Rising population leading to food shortages, particularly acute in the eastern half of the empire