Final answer:
The Substitution principle states that the highest value of a property is determined by the cost of obtaining an equally desirable substitute.
Step-by-step explanation:
The correct answer to the question is A. Substitution principle. This principle affirms that the maximum value of a property is set by the cost of acquiring an equally desirable and valuable substitute. This is because if an alternative asset or property is available at a lower cost, the maximum price that people are willing to pay for the property in question will be capped by the price of the substitute.