Question

which is the best definition of \supremacy\?
highest authority
limitless power
superior judgment
greater aptitude

Explanation:

The word "supremacy" means the state or condition of being supreme, which is equivalent to having the highest authority. "Limitless power" is more about power without bounds rather than the concept of being supreme in authority. "Superior judgment" focuses on judgment quality and "greater aptitude" on ability, neither of which directly relate to the core meaning of "supremacy" as highest authority.

Answer:

highest authority