Why Did the Birthrates of Wealthy Romans Decline by the First

Why did the birthrates of wealthy Romans decline by the first century?

A) Wealthy Romans increasingly spent money on luxuries and political careers instead of raising families.
B) Birth-control methods were beginning to take root in patrician circles.
C) Wealthy Romans increasingly converted to Christianity, which emphasized poverty and celibacy.
D) Too many died while fighting in the army or in the civil wars that had racked the republic.