A solution of 0.1 M in `CH_3COOH` and 0.1 M in `CH_3COONa`.Which of the following will change its pH significantly ?
A. Addition of water
B. Addition of small amount of `CH_3COONa` without change in volume
C. Addition of small amount of `CH_3COOH` without change in volume
D. None will change the pH singnificantly