Managers Confuse Gross Margin and Contribution Margin in Merchandising Companies

Managers confuse gross margin and contribution margin in merchandising companies because:

A) cost of goods sold equals the variable cost of goods purchased.
B) cost of goods sold does not equal the variable cost of goods purchased.
C) manufacturing costs does not equal the variable cost of goods manufactured.
D) manufacturing costs are always relevant in merchandising companies.
E) managers never confuse the margin and contribution margin in merchandising companies.