A.
DR Depreciation charge $6,000 CR Accumulated depreciation $6,000
B.
DR Depreciation charge $6,000 DR Non-current assets $12,000 CR Accumulated depreciation $18,000
C.
DR Accumulated depreciation $6,000 CR Depreciation charge $6,000
D.
DR Accumulated depreciation $18,000 CR Non-current assets $18,000