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.

The least likely limitation to the effectiveness of monetary policy is that central banks cannot:
Option A:accurately determine the neutral rate of interest.
Option B:regulate the willingness of financial institutions to lend.
Option C:control amounts that economic agents deposit into banks.

Answer: A