Fertility Rate Is Lower in the Higher Income Families and Wealthier

Fertility rate is lower in the higher income families and wealthier countries because:

A) Potential earnings of women are higher for higher income families and wealthier countries.
B) Education level is higher for higher income families.
C) The cost of living is higher for higher income families and wealthier countries.
D) Children are not normal good.
E) Cost of raising children is higher in higher income families.