Which of the Following Statements Does Not Describe Contribution

Which of the following statements does not describe contribution?

A) The surplus that arises from the production and sale of one unit of product or service.
B) The profit that is left over once all the costs of the producing or service organization have been deducted from sales revenue.
C) The marginal revenue generated from selling and producing one more unit of product or service.
D) The selling price less all the variable costs of production.