Scholars Have Shown That the Nature of the Family in Premodern

Scholars have shown that the nature of the family in premodern times was very impermanent. What is one of the likely reasons that this was true?

A) There was a very low rate of child mortality, which allowed children to live to adulthood with their families.
B) There was a very high rate of women dying in childbirth, which led to children becoming mother figures to others in the home.
C) The overall rate of marriage was far lower than it is today.
D) There was a high rate of overall mortality, which tended to dissolve family structures more frequently.