At the Beginning of 2019, a Subsidiary Sells Equipment with a Book

At the beginning of 2019, a subsidiary sells equipment with a book value of $400,000 to its parent for $500,000. At the time of the sale, the equipment had a remaining life of 5 years, straight-line. The parent still has the equipment at the end of 2020 (2 years later) .
On the consolidated financial statements for 2020, how is the equipment reported?

A) Book value $400,000, depreciation expense $100,000
B) Book value $320,000, depreciation expense $80,000
C) Book value $240,000, depreciation expense $80,000
D) Book value $200,000, depreciation expense $100,000