In the 1920s,there Were Many Fundamental Disputes Between Competing Schools

In the 1920s,there were many fundamental disputes between competing schools of thought in psychology.Which unifying theme from your text do these disputes illustrate

A)  Psychology evolves in a sociohistorical context. 
B)  Psychology is empirical. 
C)  People's experience of the world is highly subjective. 
D)  Psychology is theoretically diverse.