Three communicable diseases prevalent in developing countries caused by unsafe drinking water and bad sanitation are:

Detailed Solution:

The correct answer is “malaria, acute diarrhoea and schistosomiasis”.

The answer is: (2) malaria, acute diarrhoea and schistosomiasis

Acute diarrhea: This is a common illness caused by consuming contaminated water or food. It can lead to dehydration and even death, especially in young children.

Malaria: This parasitic disease is transmitted by infected mosquitoes. Contaminated water can create breeding grounds for mosquitoes, but stagnant water sources are not the only factor.

Schistosomiasis: This parasitic infection occurs when people come into contact with contaminated water containing specific worm larvae. These larvae can penetrate the skin and cause various health problems.