Answer:
The correct answer is the option A: unconscionable
Explanation:
To begin with, the reason why such prohibition from Marco to Fred is unconscionable is due to the fact that Marco already stated in a private contract that he agreed to sell the apartment to Fred by a certain price, therefore establishing that the property of the real estate now belongs to the other party, letting everyone else external to the contract know that the proper and new owner is Fred.
Secondly, it is understandable that now that Fred is the new owner of the apartment by contract then it is unfair and unreasonable that the old owner Marco prohibits him to do what he wants with the apartment.
