Contaminated water
a.

is unclean and may be infected with bacteria, viruses, or other pollutants
b.

is less likely to spread diseases such as cholera
c.

is good for drinking, cooking, bathing, and cleaning
d.

has been through a purification process

A Hope this helped :) ♥♥

The answer is A 
is unclean and may be infected with bacteria, viruses, or other pollutants

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath. 

Where are the options