The warning of the authority falls on deaf ears. Here warning does the function of—

✅ কেন সঠিক: In ‘The warning of the authority falls on deaf ears’, ‘warning’ is the subject of the verb ‘falls’ and is preceded by the article ‘the’, so it functions as a noun (a gerund-derived noun).

❌ অন্য অপশন: It does not modify a noun (adjective), describe a verb (adverb) or act as the main verb — the verb of the sentence is ‘falls’.

💡 মনে রাখুন: A word after an article and acting as subject/object = noun, even if it ends in -ing.

📖 শব্দার্থ: fall on deaf ears — কেউ কানে তোলে না, উপেক্ষিত হয়।