Which of the following aqueous solutions will have a pH value between 4.0 and 5.0 at $$25^\circ\text{C}$$?

A

0.01 M solution of benzoic acid with $$K_a = 6.6 \times 10^{-5}$$ at $$25^\circ\text{C}$$

B

0.02 mol benzoic acid and 0.05 mol sodium benzoate dissolved in appropriate amount of water to make a solution of 1 L

C

A mixture of 999 mL water and 1 mL of 0.2 M HCl

D

499 mL of 0.01 M NaOH and 501 mL of 0.01 M HCl mixed together