Which of the Following Best Defines the Term Demographic Transition

Which of the following best defines the term demographic transition ?

A) A high mortality rate will continue in Western nations.
B) When parents stop viewing children as an economic necessity.
C) When parents continue to have more children because of a need for social security in old age.
D) The non-Western world began industrialization and rural laborers migrated to the cities.
E) The non-Western world will experience an immigration influx due to land resources.