ExplanationThere are allegations of preferential treatment or unfairness at the local level, and these are threatening to spill over into criticisms that the system is unfair or partial at the national level.
But you are told that the system’s fairness is not currently in dispute at that level, so you are looking for synonyms for fairness or impartiality. The correct answers are equity and probity.
Hence options probity, equity are best fit!
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