Sometimes project managers forget all of the expenses that they can incur on a project, such as capital resources and assets. This can have an impact upon their budgets and the economic return on the project. A cost that has been incurred and cannot be reversed is known as a

Answer D is correct because a sunk cost is a project expense that will eventualy need to be paid. Answer A is incorrect because a fixed cost remains constant, regardless of any change in a company's activity. Answer B is incorrect because direct cost can be directly linked to producing specific goods or services. Answer C is incorrect because a variable cost changes in proportion to a change in the company's activity or business.