Sandy,an Old Car Enthusiast,has Been Hired by Pat to Find

Sandy,an old car enthusiast,has been hired by Pat to find and buy a fully-restored 1955 Ford Thunderbird for Pat.Sandy finds such a car in pristine condition,and she would actually like to purchase the Thunderbird for herself.She tells Pat about the car,but Pat declines to purchase the car because it has an automatic transmission.Sandy then buys this car for herself.What has Sandy done in violation of her duty of loyalty?

A) Sandy has usurped an opportunity.
B) Sandy has not violated her duty of loyalty to Pat.
C) Sandy has engaged in self-dealing
D) Sandy has competed with the principal.
E) Sandy has misused confidential information.