Aqueous solutions of HNO3, KOH, CH3COOH, and CH3COONa of identical concentrations are provided.
The pair(s) of solutions which form a buffer upon mixing is(are)
(A) 3 HNO and 3 CH COOH (B) KOH and 3 CH COONa
(C) 3 HNO and 3 CH COONa (D) 3 CH COOH and 3 CH COONa