Which of Your Text's Unifying Themes Is Illustrated by the Fact

Which of your text's unifying themes is illustrated by the fact that choices which are objectively identical can seem very different when reframed in different terms

A)  People's experience of the world is highly subjective. 
B)  Behaviour is shaped by our cultural heritage. 
C)  Psychology is theoretically diverse. 
D)  Heredity and environment jointly influence behaviour.