Which of the following statements is true about buffer solution?
A) They fluctuate in pH when acids or bases are added to them.
B) They maintain a relatively constant pH when either acids or bases are added to them.
C) They maintain a constant pH when bases are added to them but not when acids are added to them.
D) They maintain a constant pH when acids are added to them but not when bases are added to them.
Answer: B) They maintain a relatively constant pH when either acids or bases are added to them