Answer:
a. functionalist
Step-by-step explanation:
Functionalist perspective: In sociology, the term functionalist perspective is based on the work of Robert Merton, Emile Durkheim, Talcott Parsons, and Herbert Spencer.
The functionalist perspective states that a particular society is considered as a system of different interconnected parts that is being working together in harmony to maintain or create a balanced state and social equilibrium as a whole.
In other words, the functionalist perspective demonstrates a society as an entire complex system that consists of different parts to work together to give rise to stability and solidarity.