On average, European women are 10 years older than women in sub-Saharan Africa when they have their first baby. Which of the following is not a contributing factor to this?

I don't know what options there were, but i can tell you some contributing factors; maybe this helps:
-higher education of women
-higher cost of raising babies in Europe
-smaller mortality of children in Europe
-higher age of marriage in Europe
-More personal independence in Europe.

did i get any of the options right?