Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Which of the following is a limitation on the ability of central banks to stimulate growth in periods of deflation?
Option A:Ricardian equivalence.
Option B:The interaction of monetary and fiscal policy.
Option C:The fact that interest rates have a minimum value (0%).

Answer: C