Final answer:
The 'blank slate' idea appeals to its promotion of individuality and personal freedom, as it suggests that knowledge and character are developed from personal experiences, not predestined by birth or heritage.
Step-by-step explanation:
The political or social appeals of the "blank slate" idea align with the Promotion of individuality and personal freedom (Option B). The idea of a blank slate, or tabula rasa, suggests that individuals are born without built-in mental content and that all knowledge comes from experience or perception. This viewpoint emphasizes the potential for personal growth and the shaping of one's own destiny without preordained limits, thus promoting individual rights and liberties.
In contrast, the appeals of traditions (Option A), strict social hierarchies (Option C), and hereditary privileges (Option D) contradict the essence of the blank slate concept which inherently opposes the idea that one's role in society is predefined by birth or tradition.