💡 Detailed Explanation
"潔く (isagiyoku)" describes an attitude of accepting a mistake or defeat and stepping down cleanly without making excuses. In this context, it is the most suitable word for describing someone who admits their mistake and resigns without lingering attachment. "清々しく (sugasugashiku)" expresses a refreshing feeling. "潔白に (keppaku ni)" means to claim innocence. "雄々しく (ooshiku)" describes a brave appearance, but in the context of admitting a mistake, "潔く" is more natural.