A Homeowner Desires to Sell His or Her Home and Signs

A homeowner desires to sell his or her home and signs an exclusive-agency listing agreement, requiring payment of a six percent commission to the real estate agent. If shortly thereafter, before the agent has time to do anything to sell the property, the owner surprisingly finds a couple who  purchases it for $400,000, the homeowner​

A) must pay a commission of $24,000 to the listing agent.
B) is not obligated to pay a commission.
C) is not obligated to pay a commission, unless the agent has placed the listing in the local multiple-listing service.
D) must pay a commission of $12,000, but is entitled to retain the other half because he or she found the buyer.