Assertion : Addition of `HCl(aq)` to `HCOOH(aq)` decreases the ionization of `HCOOH(aq)`
Reason : Due to common ion effect of `H^(+)`, ionization of `HCOOH` decreased.
A. If both assertion and reason are true and the reason is the correct explantion of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.