Which statement causes more undo generation?

View the Exhibit.

Which statement causes more undo generation?

A.
DELETE FROM emp WHERE empno=7934;

B.
UPDATE emp SET comm=400 WHERE empno=7844;

C.
INSERT INTO emp VALUES(7999,’JHON’,’CLERK’,7782,’10-MAY-83′,1500,NULL,10);

D.
SELECT * FROM emp;