Which of the following is not studied by demographers?
a. growth rate c. geographic distribution
b. age structure d. none of the above

 D.

Demographers acquire all that data in questionnaires and surveys.

Option- D

A demographer is a professional who carries out his or her work on the various expects of the population, such as the number of the people who migrates from one part of the globe to the another region in a given time.Along with this the size of the population is also taken under consideration, as to what extent the population is positioned or oriented in a specific manner or alignment.While, the different age groups are also studied and there structure is taken under consideration, as to what extent there are adults, kids, men and women involved in this population presence inside a specific region.