Which mixture will form a buffer in aqueous solution?

A.     \({\text{0.10 mol N}}{{\text{H}}_{\text{3}}} + {\text{0.20 mol HCl}}\)

B.     \({\text{0.10 mol N}}{{\text{H}}_{\text{3}}} + {\text{0.20 mol NaOH}}\)

C.     \({\text{0.10 mol NaOH}} + {\text{0.20 mol KCl}}\)

D.     \({\text{0.20 mol N}}{{\text{H}}_{\text{3}}} + {\text{0.10 mol HCl}}\)

D