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 is not true of mark-to-model valuations?
Option A:Return volatility may be understated.
Option B:Returns may be smooth and overstated.
Option C:A calibrated model will produce a reliable liquidation value.

Answer: C