Cost-volume-profit analysis includes all of the following assumptions except:. a. all units produced are sold.
b. changes in activity are the only factors that affect costs.
c. the behavior of costs is curvilinear throughout the relevant range.
d. costs can be classified accurately as either variable or fixed.

a. all units produced are sold.

Explanation:

Cost-volume-profit analysis  is also known as breakeven analysis. It is an analysis that review the point or number of units a company must sell for the revenue or sales to equate the total cost. In other words, the point the company neither makes a profit nor a loss.. The assumptions of this analysis are;

(i) The total costs are recognized as fixed and variable. Where as in reality, some costs may be semi-variable cost.

(ii) It assumes a linear relationship between costs and sales.  

(iii) The selling price per unit of the product is constant.

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