Final answer:
In cost-benefit analysis, the least attractive alternative is usually one with substantial costs but primarily intangible benefits, as they provide uncertain payoffs which may not justify the investment or effort.
Step-by-step explanation:
In a cost-benefit analysis, the alternative that is not likely to be an attractive choice is b) Alternatives with substantial costs but primarily intangible benefits. This is because, in a cost-benefit analysis, decision-makers look for choices that provide clear, tangible benefits that outweigh the costs. Alternatives with substantial costs and little to no tangible benefits are usually seen as less favorable because the payoffs are uncertain and may not justify the investment or effort. Conversely, alternatives with minimal costs and substantial benefits are typically the most attractive, as the investment is low and the rewards are high.
Alternatives with no costs and no benefits may be neutral and not really factor into a decision-making process, because they neither add value nor detract from the situation. It's the balance between the costs and the benefits that is critical in cost-benefit analysis. When costs are significant and benefits are intangible or less certain, the decision to proceed with such alternatives is often viewed with caution, as it's harder to justify the expenditure.