Which theoretical orientation insisted that observations be verifiable

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

Theoretical Orientation

A foundational perspective or framework that guides a psychologist's approach to understanding and treating clients.

Observations

The action or process of closely monitoring or noting phenomena to gather data or arrive at conclusions.

Verifiable

Capable of being proven true or accurate through evidence or demonstration.