Which of the two solutions below has a higher buffering capacity? Explain why one solution has a better ability to resist changes in pH.
a) Solution A: pH = 4.5; Solution B: pH = 5.5
b) Solution A: pH = 8.0; Solution B: pH = 9.0
c) Solution A: pH = 7.0; Solution B: pH = 7.5
d) Solution A: pH = 6.0; Solution B: pH = 7.0