Which can act as buffer? (A) \( \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{OH} \) (B) \...

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Which can act as buffer?
(A) \( \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{OH} \)
(B) \( \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{3} \mathrm{COONa} \)
(C) \( 40 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{NaCN}+20 \mathrm{~mL} \) of \( 0.1 M \mathrm{HCl} \)
(D) All of the above
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