How Is the Contribution Margin Calculated When Utilizing Variable Costing

Multiple Choice

How is the contribution margin calculated when utilizing variable costing?

A) Sales less variable cost of goods sold
B) Sales less variable cost of goods sold,less variable selling and administrative expenses
C) Sales less cost of goods sold
D) Sales less variable cost of goods sold,less variable selling and administrative expenses,less fixed cost of goods sold,less fixed selling and administrative expenses