Answer: Listing expires and terminated
Explanation: In the scenario above, Avalon homes only serves to aid the sale of Trina's property and as such will not be held liable for any offense if the property isn't sold within the listing period. Avalon homes isnt responsible for either the slow nature of market at the time or the fact that Trina's property belongs to the high end category which often takes even more time to get a buyer for. Therefore, once the contract period of Trina's listing is reached, the listing expires and it's terminated unless another listing contract is struck between both parties.