Montrice is conducting a study of the effect of economic recessions on marriage rates in European countries. What type of sociology is this?

The type of sociology used by Montrice is macro sociology.

Explanation:

The approach in sociology that aims in studying about the social systems and population is called Macro sociology. It has theoretical abstraction at higher levels. It is contrast to micro sociology. Because this focuses mainly on smaller portion of larger society such as families, individuals, etc.

These are also considered in macro sociology but they are always related with the large society. It focuses on a large scale such as countries, cities, etc. It considers the factors in the larger society which can be then applied to the smaller society. Macro sociology deals with broad societal trends that can later be applied to the smaller features of a society.