A few years ago, Curtis purchased a structure for $100,000 that was originally placed in service in 1933. This year, he incurred qualifying rehabilitation expenditures of $200,000. The amount of the tax credit for rehabilitation expenditures, and the amount by which the building's basis for cost recovery would increase as a result of the rehabilitation expenditures are the following amounts:

A. $20,000 credit; $180,000 basis

B. $20,000 credit; $200,000 basis

C. $20,000 credit; $300,000 basis

D. $40,000 credit; $160,000 basis

Please explain