Which journal entry reflects the adjusting entry needed on December 31?:

Last year, BOC purchased a building for $1,000,000. The expected life of the building is 20 years and its expected salvage value is $200,000. Now, it is December 31, the end of the fiscal year. No other entries were recorded for this building during the year.

a)Dr. Depreciation Expense 50,000

Cr. Accumulated Depreciation 50,000

b)Dr. Depreciation Expense 40,000

Cr. Accumulated Depreciation 40,000

c)Dr. Depreciation Expense 40,000

Cr. Building 40,000

d)Dr. Depreciation Expense 50,000

Cr. Building 50,000

e)No entry needed. The building was not purchased this year.