Warren Thompson studied the mortality and birth rates in industrialized societies by looking at how many years of data?

25

100

200

250

The correct answer is - 200.

Warren Thompson is one of the best known demographers, having created his own model of the demographic transition in the societies. Thompson studied carefully and in detail the information he had available about the mortality and the birth rates from a period of around 200 years. Based on the information he gathered and analyzed, Thompson managed to come to certain conclusions about the mortality and birth rates in the industrialized societies thus make his own theory about it.