Regarding scuba diving, which statement is incorrect? ( )

A.Scuba diving is a form of underwater diving in which a diver uses a self-contained underwater breathing apparatus (SCUBA)to breathe.

B.Essential scuba gear includes tanks, scuba diving masks, buoyancy compensation devices (BCD), regulators, fins, wetsuits and safety sausages.

C.Scuba diving is a risk-free sport.

D.Before you go scuba diving, you will need some training from a qualified scuba diving instructor.

正确答案：Scuba diving is a risk-free sport.