When we want to mean a government by the richest class we use the term—

✅ কেন সঠিক: Plutocracy is government by the wealthy (Greek ‘ploutos’ = wealth).

❌ অন্য অপশন: Oligarchy is rule by a small group; cryptocracy is rule by a secret group; aristocracy is rule by the nobility or a privileged class by birth.

💡 মনে রাখুন: pluto- = wealth, oligo- = few, aristo- = best/noble, demo- = people, auto- = self.

📖 শব্দার্থ: plutocracy — ধনিকতন্ত্র; oligarchy — গোষ্ঠীতন্ত্র; aristocracy — অভিজাততন্ত্র।