Final answer:
a. Opportunity costs. c. Sunk costs. d. Variable costs. The costs associated with finding a desired solution to a problem include opportunity costs, sunk costs, and variable costs.
Step-by-step explanation:
When it comes to finding a desired solution to a problem, the costs associated with it can vary. The costs that are typically considered in this context are opportunity costs, sunk costs, and variable costs. Opportunity costs refer to the value of the next best alternative that is forgone when making a decision. Sunk costs, on the other hand, are costs that have already been incurred and cannot be recovered. Finally, variable costs are the costs that change in relation to the level of production.