Which of the following pairs of ions would make the best buffer with a basic pH? Ka for HC3H2O2 = 1.75 × 10^-5. Ka for HPO42- = 4.8 × 10^-13.
(A)H2SO4 and H2PO4 (B)HPO42- and NaH2PO4- (C)HC3H2O2 and NaC3H2O2 (D)NaOH and HC2H3O2
B