Which school of psychology made a clear distinction between observable behaviours and unobservable thoughts and feelings

A)  functionalism
B)  behaviourism 
C)  psychoanalysis
D)  structuralism

Observable Behaviours

Actions or reactions of an individual that can be directly seen and measured.

Behaviourism

A theoretical orientation based on the premise that scientific psychology should study only observable behavior and investigates how organisms learn new behaviors or modify existing ones, depending on whether events in their environments reward or punish these behaviors.