Which of the Following Is TRUE

Multiple Choice

Which of the following is TRUE?

A) An effective buffer has a [base]/[acid] ratio in the range of 10-100.
B) A buffer is most resistant to pH change when [acid] = [conjugate base].
C) An effective buffer has very small absolute concentrations of acid and conjugate base.
D) The capacity of a buffer cannot be exceeded by adding too much strong base. It can only be exceeded by adding too much strong acid.
E) A buffer has the best resistance to pH change when the buffer's pH is significantly lower than the pK_a of the acid used to make the buffer solution.