Carlos Instructs His Sales Agent,Edgar,not to Sell on Credit to Andrew

Carlos instructs his sales agent,Edgar,not to sell on credit to Andrew because Carlos has experienced problems collecting from Andrew for prior purchases.Edgar sells on credit to Andrew,who pays properly.Has Edgar violated any obligation to Carlos?

A) No,Edgar has not violated any obligation since Andrew paid properly.
B) Yes,Edgar has violated the duty to exercise reasonable judgment.
C) No,Edgar has not violated any obligation,since Edgar did not evaluate Andrew's credit worthiness correctly.
D) Yes,Edgar has violated the duty to obey all instructions of the principal.