How much percentage of all communicable diseases are water borne?

The correct option is B

21%

The correct option is B.

Explanation of the correct option:

1. All kinds of diseases can be classified into two groups- communicable and non-communicable diseases.
2. Some diseases can be very easily transmitted from an infected person to a healthy person. These are called communicable diseases.
3. 21% of all communicable diseases are transmitted through water.
4. Many pathogens or disease-causing parasites breed in water.
5. These enter the human body when contaminated water is used by people for drinking or other purposes.
6. Malaria, typhoid and amoebiasis, and ascariasis are some water-borne communicable diseases.

Final answer: 21% of all communicable diseases are water borne.