What Was the Underlying Reason for the Illegitimacy Explosion of 1750-1850

What was the underlying reason for the illegitimacy explosion of 1750-1850?

A) Social and economic transformations that made it harder for families and communities to supervise behavior
B) The decline of traditional moral standards owing to the Enlightenment
C) Decreasing availability of birth control in the countryside
D) The sexual exploitation of poor girls by wealthy men