What is the principal difference between the Nature of Expense Method and the Function of Expense Method?

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In presenting expenses, you classify them either by the nature of the cost or by the function the cost serves. The Nature of Expense Method groups expenses by what they are—salaries and wages, depreciation, rent, utilities, raw materials, and so on—so you see cost types outlined without tying them to specific activities. The Function of Expense Method, in contrast, groups costs by their purpose in the business—production or cost of goods sold, selling expenses, and administrative expenses—so you can see how much each function consumes.

The key difference is the criteria for grouping: type of cost versus activity or responsibility. That’s why this option is correct—the Nature of Expense Method organizes by nature, while the Function of Expense Method organizes by function. Note that depreciation isn’t excluded in the function method; it would be allocated to the function it supports (for example, manufacturing or administration), just as it appears as its own line item in the nature method. The other statements don’t fit because they either reverse the grouping, claim identical presentations, or suggest depreciation is excluded.