Final answer:
Seller Skinner signed an exclusive right to sell listing but later cancelled it and accepted an offer from Broker Paul.
Step-by-step explanation:
In this scenario, Seller Skinner initially signed a 90-day exclusive right to sell listing with Broker Bill. However, two weeks later, Skinner cancelled the listing with Bill and gave open listings to Broker Carl and Broker Paul. Three weeks later, Paul presented an offer to Skinner, which the seller accepted.