The correct answer is: A. Goodwill
Goodwill is an intangible asset that arises when a company acquires another company for more than the fair value of its net assets. It is not recorded in the books of account because it is not considered to be a tangible asset.
Trade discount is a reduction in the price of goods that is offered to customers who purchase a certain quantity of goods. It is recorded in the books of account as a reduction in the cost of goods sold.
Special discount is a reduction in the price of goods that is offered to customers for a limited time period. It is recorded in the books of account as a reduction in the cost of goods sold.
Cash discount is a reduction in the price of goods that is offered to customers who pay their invoices within a certain time period. It is recorded in the books of account as a reduction in accounts receivable.