B purchased an old textile factory building in Chicago that had been certified as a historic structure. The purchase price was $1 million, and he spent $3 million this year renovating it. Bs tax credit [without regard to possible limitations imposed by 38(c)] and his basis in the building are a. $60,000 credit; $4 million basis. b. $300,000 credit; $3,700,000 basis. c. $600,000 credit; $3,400,000 basis. d. $600,000 credit; $400,000 basis.