बृहन्मुंबई महानगरपालिकेच्या सर्व प्रकारच्या सर्वसाधारण सभांसाठी गणपूर्ती संख्या ही एकूण सदस्यसंख्येच्या _______ एवढी असते.

The correct answer is Option D (1/5).

Key Points:
• Quorum Rules for Brihanmumbai Municipal Corporation (BMC):
• Statutory Framework: The governance of the Brihanmumbai Municipal Corporation is regulated by the Mumbai Municipal Corporation Act, 1888 (formerly Bombay Municipal Corporation Act).
• Quorum Requirement: According to the specific provisions of the Act governing general meetings and proceedings, the quorum required for transacting business at any general meeting of the Corporation is one-fifth (1/5th) of the total number of incumbent councillors.
• Comparative Context: While parliamentary bodies and standard municipal laws generally prescribe a quorum of one-tenth (1/10th), the BMC Act specifically mandates a higher threshold of 1/5th to ensure substantial representation and active participation of members before decisions can be legally adopted.
• Therefore, option 4 (1/5) is the correct statutory answer according to the official final answer key.
• Key Takeaway: The quorum for general meetings of the Brihanmumbai Municipal Corporation (BMC) is 1/5th of total members.