Compare and explain changes in LDC birth and death rates over the past 50 years.

a. Birth rates fell faster than death rates because modern contraceptive became commonplace

b. Birth rates fell faster than death rates because of massive emigration of young child-bearing people.

c. Death rates fell faster than birth rates because modern medical technology, such as antibiotics cut death rates quickly and substantially while birth rates, reflecting cultural and religious values, fell much more slowly.

d. Death rates fell faster than birth rates largely because of the AIDS epidemic in Sub-Sahara Africa.

e. Birth and death rates have changed little in the past century, both reflecting LDC's unwillingness to engage in economic development.