Rates of Secure and Insecure Attachment Vary Across Different Cultures,perhaps

Rates of secure and insecure attachment vary across different cultures,perhaps related to differences in parenting styles that are more or less common in different countries.Which of your text's unifying themes does this illustrate

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