Why might have been the system of philosophy developed by the Greek philosophers important for effective leadership?

Just took the test and this is the correct

Socrates stated that personal honor important for leaders. Plato stated rulers should be intellectually and philosophically trained to be successful. Aristotle developed a system of logic for making compelling arguments. These philosophers believed these characteristics and skills were essential for effective leadership instead of superficial concepts such as wealth and power.

Explanation:

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.