Fara hires Gill, a real estate broker, to act as her agent to sell her land for a set price of $150,000. Before the land is sold at the stated price, Gill learns that there is oil beneath it, causing its market value to increase substantially. So, without telling Fara what she knows, Gill decides to sell the land to her son for the $150,000 price. This is

	a.	not a problem because the agency agreement terms do not mention any agent's duties owed to a principal.
	b.	a criminal act for which the principal is vicariously liable to the agent.
	c.	a violation of an agent's duties owed to a principal.
	d.	a violation of a principal's duties owed to an agent .