Which of the following statements is true? Opportunity costs should not be considered when making decisions. Unavoidable costs are relevant costs. Only those costs and benefits that differ between alternatives are relevant in a decision Joint costs are relevant in decisions regarding what to do with a product from the split-off point forward. QUESTION 8 Which of the following is an opportunity cost? warehouse building. The depreciation on an asset purchased this year Foregone wages when giving up a job to go to school. The cost of an asset purchased ten years ago