A 25-year-old woman complains of shortness of breath and palpitation after exercise for 3 years.PE：cardiac dullness shifted to the lower and left，narrow cardiac waist，the heart shaped like a boot，which should be considered the first diagnosis
A
aortic valve insufficiency
B
pulmonary heart disease
C
dilated cardiomyopathy
D
pure mitral stenosis
E
hypertensive heart disease