Answer:
The correct answer is letter "B": None of the answers is correct.
Step-by-step explanation:
Marginal decisions imply considering two factors: total benefits and total costs. A rational choice would imply going ahead with a decision if the total benefits are greater than the total costs and discarding a decision when the total costs are higher than the total benefits.
Therefore, while deciding to buy a second car, it must be considered if the total benefits of having two cars are greater than the costs of owning two cars.