Which of These Statements Does NOT Describe Chemical Buffer Systems

Multiple Choice

Which of these statements does NOT describe chemical buffer systems

A) They minimize changes in the pH of a solution when an acid or a base is added to or removed from the solution.
B) They can act within a fraction of a second to buffer changes in hydrogen ion concentration.
C) The direction of their reaction is determined according to the law of mass action.
D) They promote H⁺ excretion by the kidneys when acidosis is present.