Which of following descriptions about early gastric carcinoma is NOT true？ （）

A.Cancer is confined to the mucous layer

B.Cancer is confined to the submucosa layer

C.Cancer involves the muscular layer

D.Cancer involves the submucosa， elevation of mucous layer less than 5mm

E.Cancer involves the submucosa， causing invagination less than 5mm

正确答案：Cancer involves the muscular layer