Disposal

Joan has traded in a non-current asset The entries in her journal include Dr Non-current assets at cost Cr Asset disposal What aspect of the transaction is recorded by this entry? a. Cash proceeds from disposal of the old non-current asset b. Cash payment for purchase of the new non-current asset C. Transfer of the original cost of the old non-current asset on disposal d. Trade in value of the old non-current asset I think D. Please help.