The Demographic Transition Model Seeks to Explain the Steps Necessary

The demographic transition model seeks to explain the steps necessary for a country to move from a poor (less developed) to a richer (more developed) economy.Which one of the following statements about the model is correct?

A) Initially,poor countries have low birth rates and high death rates.
B) As the economy improves,the birth rate rises and the death rate falls.
C) After an economy has completed the demographic transition,the birth rates are low and the death rates are low.
D) As the economy improves,the birth rate falls and the death rate stays the same.