A 29-year-old man came to the emergency room for dizziness.Echocardiography shows ventricular septum thickening，the part in left ventricle outflow tract protruding into left ventricle.Hypertrophic cardiomyopathy is considered.Which of the following is probably wrong
A: Cardiac dullness mildly enlarged
B: S4 can be heard
C: markedly increased A2
D: 3/6grade systolic murmur at apical area
E: rough ejection systolic murmur in the 3rd-4th left intercostal space