Final answer:
Classical theory's most significant deterrent is the emergence of broader perspectives; in historical terms, this is exemplified by the limitations of Classical Greece's influence and the eventual expansion under Macedonia, whereas in physics it is the transition from classical to modern physics, with its revolutionary theories like relativity and quantum mechanics. Philosophically, postmodernism's challenge to the classical prioritization of reason illustrates a similar shift in thought.
Step-by-step explanation:
The question pertains to the most important deterrent of classical theory within the context of social studies, particularly focusing on classical physics and the historical age of Classical Greece. When examining the deterrents of classical theory, it's crucial to recognize that while classical physics has provided a foundation for understanding the universe, it faces limitations when dealing with modern concepts introduced by relativity and quantum mechanics.
In reviewing the historical context, one can conclude that the spread of the intellectual culture of Classical Greece was deterred largely by the Greeks' own perception of cultural superiority and military limitations relative to empires like Persia. This changed with the rise of Macedonia and Alexander the Great who expanded Greek influence. Similarly, in physics, the transition from classical thinking to acknowledging the necessity of modern physics represented a significant intellectual shift.
In the realm of philosophy and critical theory, the classical reliance on reason and objective thinking was deterred by postmodernism's acceptance of multiple truths and contextual appreciation. This shift from the classical to the modern illustrates the primary deterrents within different classical theories: the emergence of more comprehensive perspectives.