A water sample has ppm level concentration of the following metals: Fe = 0.2; Mn = 5.0; Cu = 0.01; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:

A water sample has ppm level concentration of the following metals: Fe

1.	A water sample has ppm level concentration of the following metals: Fe = 0.2; Mn = 5.0; Cu = 0.01; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:
A.	Zn
B.	Fe
C.	Mn
D.	Cu
Answer» D. Cu