In 1980, Artima Corporation Purchased an Office Building for $400,000

In 1980, Artima Corporation purchased an office building for $400,000 for use in its business. The building is sold during the current year for $550,000. Total depreciation allowed for the building was $390,000; straight- line would have been $360,000. As result of the sale, how much Sec. 1231 gain will Artima Corporation report?

A) $510,000
B) $150,000
C) $398,000
D) $540,000