All of the following statements concerning acid-base buffers are true EXCEPT- A) Buffers are resistant to pH changes upon addition of small quantities of strong acids or bases. B) A buffer maintains the pH of a solution at pH 7 or very close to it. C) The pH of a buffer is close to the pKa of the weak acid from which it is made. D) Buffers contain appreciable quantities of a weak acid and its conjugate base. E) Buffers are resistant to changes in pH when diluted with water.