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100 mL of 0.02M benzoic acid (pK(a)=4.2)...

`100 mL` of `0.02M` benzoic acid `(pK_(a)=4.2)` is titrated using `0.02 M NaOH`. `pH` values after `50 mL` and `100 mL` of `NaOH` have been added are

A

`3.50,7`

B

`4.2,7`

C

`4.2, 8.1`

D

`4.2, 8.25`

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