​Chuck Hires Danielle, a Real Estate Broker, to Act as His

​Chuck hires Danielle, a real estate broker, to act as his agent to sell his land for $150,000. Oil is discovered beneath the land, causing its market value to increase considerably. The agency agreement is likely

A) ​continued with a proportionate increase in Danielle's sales commission.
B) ​continued until Danielle tells prospective buyers of the discovery.
C) ​terminated by act of the parties.
D) ​terminated by operation of law.