How to properly say sorry and thanks in case of the delay?

A.We are sorry to inform you that the flight has been cancelled.

B.It is pitiful that the goods are sold out.

C.We apologize for any inconvenience caused and thank you for your patience and understanding.

D.We are waiting for air traffic control clearance.

正确答案：We apologize for any inconvenience caused and thank you for your patience and understanding.