Which of the following is NOT the criteria for defining urban settlements in India as per Census 1991 ?

Density of population of at least 300 persons per square km.

The census of India, 1991 defines urban settlements as “All places which have municipality, corporation, cantonment board or notified town area committee (A) and have a minimum population of 5000 persons (C), at least 75 per cent of male workers are engaged in non-agricultural pursuits (D) and a density of population of at least 400 persons per square kilometers are urban (B is incorrect).