As per the National Building Code of India and housing overcrowding standards, a dwelling is considered overcrowded when floor area per person is less than:

• A 3.5 square meters per person
• B 5.0 square meters per person
• C 7.5 square meters per person
• D 9.5 square meters per person ✓

Explanation

Indian housing standards specify overcrowding when usable floor area falls below 9.5 square meters per person. This criterion is used in urban housing surveys and public health inspections. The figure differs from international standards such as the British standard of 11 square meters. Option A would be far too low to meet even minimal ventilation requirements.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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