DL Motor Sales sold its old office furniture for $6,000. The original cost was $10,000, and at the time of sale, accumulated depreciation was $7,000. What is the effect of this transaction? DU O A. loss of $6,000 O B. gain of $6,000 O C. gain of $3,000 O D. loss of $3,000 ac DUE ad DUE hiir