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