Which of the Following Is an Example of an Agent's

Which of the following is an example of an agent's breach of fiduciary duty to his or her principal?

A) An agent for the vendor makes a profit on the transaction he negotiated for his or her vendor above his or her commission and doesn't tell the principal/vendor.
B) An agent negotiates a higher price than the highest sale price reasonably possible at that time.
C) The agent takes presents from the third party and passes them on to the principal.
D) An agent for the vendor collects a commission from the purchaser but told his or her principal and obtained the principal's consent.
E) An agent discloses to his principal/vendor that he or she is giving some of his or her commission to the purchaser to induce the purchaser to sign the contract that the principal/vendor wants.