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Answer (A) is correct . Joint products are created from processing a common input. Joint costs are incurred prior to the split-off point and cannot be identified with a particular joint product. As a result, joint costs are irrelevant to the timing of sale. However, separable costs incurred after the split-off point are relevant because, if incremental revenues exceed the separable costs, products should be processed further, not sold at the split-off point.

Answer (B) is incorrect because Joint costs have no effect on the decision as to when to sell a product.
Answer (C) is incorrect because Sales salaries for the production period do not affect the decision.
Answer (D) is incorrect because Purchase costs are joint costs.