Which of the following statements concerning buffers is false?

a. Buffers contain appreciable amounts of a weak acid and it conjugate base.

b. The pH of a buffer is close to the pKa of the weak acid from which it is made.

c. Buffers are used to titrate weak bases.

d. Buffers are resistant to changes in pH brought about by addition of strong acids and bases.

e. Buffers are resistance to changes in pH brought about by addition of water.