Which modern sociological theory states that the best way to analyze society is to identify the purpose that different aspects or phenomena serve in society?

I believe the answer is: Functionalism

According to the functionalism theory, society is complex mechanism that could only operate if the members of society fulfil each of our own function. The results of the work from one member society would be important for the well being of the others.

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;