A seller expects to inherit a residential property under the terms of a will which is currently in probate, and is seeking a buyer. Which of the following is the greatest potential risk in such a transaction, and could make the transaction impossible?

$$ A$.$ There is a recorded mechanic's lien against the property.

$0.$

The estate of the deceased has monetary debts that need to be settled.

$$ C$.$ The will is being challenged by other relatives to whom the deceased left no property.

$$ D$.$ The deceased sold the property to another party after making the will, but before dying.