Assertion (A) Calgon is used for removing `CA^(2+) and Mg^(2+)` ions from hard water.
Reason (R ) Calgon forms precipitates with `Ca^(2+) and Mg^(2+)`
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is fales
D. Both A and R are fales.