Grover Inc Wishes to Use the Revaluation Model for This

Multiple Choice

Grover Inc wishes to use the revaluation model for this property: $$\begin{array} { | l | r | } \hline & \text { Before Revaluation } \\\hline \text { Building Gross Value } & 120,000 \\\hline \text { Building Accumulated Depreciation } & 40,000 \\\hline \text { Net carrying value } & 80,000 \\\hline\end{array}$$
-According to the table above.The fair value for the property is $20,000. What amount would be booked to the "accumulated depreciation" account if Wilson chooses to use the proportional method to record the revaluation?

A) $0
B) $30,000 debit.
C) $30,000 credit.
D) $60,000 debit.