The correct answer is C. Variable costs are costs that change with the level of production. For example, the cost of raw materials used to produce a product is a variable cost, because it will increase as more products are produced.
Option A is incorrect, because sunk costs are costs that have already been incurred and cannot be recovered. For example, the cost of purchasing a factory is a sunk cost, because it cannot be recovered even if the factory is no longer used.
Option B is incorrect, because
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