Unfortunately however these slums dwellers are looked upon by the society as an appendix causing ills in the urban society.
Which of the following sentence would immediately precede the above sentence?

Health officials have been warning the government against the transmission of contagious diseases from the slum areas to other parts of the city

Slum dwellers not only play a significant role in urban economy but also provide cheap labour for everyday work of the cities

A recent report suggested that 34 per cent of government lands is illegally occupied by the slum dwellers

The slum dwellers live in sub human unhygienic conditions in their tiny shanties and are very often hubs for criminal activities

None of these