Which statements about the treatment of domestic water supplies are correct?
1 The water undergoes sedimentation to remove dissolved solids.
2 The water is filtered to remove insoluble solids.
3 The water is treated with carbon to improve the taste.
4 The water is chlorinated to decrease the pH.
A) 1 and 2
B) 1 and 4
C) 2 and 3
D) 3 and 4