Answer:
The answer is A- The listing agreement is enforceable against the surviving spouse
Step-by-step explanation:
The listing agreement is enforceable against the surviving spouse because the couple which includes both dead and surviving spouse earlier indicated that they might accept the offer. In joint tenancy, upon the death of member the survivor immediately inherits the property. Since the couple held a title in joint tenancy then the listing contract is valid and the surviving spouse can choose to sell the property.