Concept:Birth rate increases when more children are born; factors that cause deaths do not raise the birth rate.
Explanation:Encouraging early marriages leads to longer childbearing periods, so birth rate rises.
Encouraging polygamy increases the number of couples having children, raising birth rate.
Legislation against abortion prevents termination of pregnancies, increasing live births.
Inadequate health services raise the death rate, especially among infants and mothers, but they do not increase the birth rate.
Therefore, inadequate health services are the exception.
Answer:B. Inadequate health services