Concept:The realization concept governs when revenue should be recorded in the books.Explanation:Revenue is recognized only when the goods are actually sold or delivered to the buyer.Merely receiving an order or producing goods is not enough to record revenue.The sale completes when ownership and the associated risks are transferred.This is the essence of the realization concept.Therefore, among the listed options, the realization concept correctly matches the given statement.Answer:A. realization concept