The addition of small amounts of either acid or base to a buffer solution causes only small changes in $pH$ because the buffer solution
- ADoes not contain either $H_3O^{+}$ or $OH^{-}$
- BContains large amounts of both $H_3O^{+}$ and $OH^{-}$
- CReacts with the added acid or base
- DContains a strong acid and the salt of the same strong acid
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