Regarding pregnancy complicated with heart disease, which one is CORRECT?

A、Rheumatic heart disease accounts for most cases in recent years. ;

B、The risk of cardiac failure is maximal during 32-34 weeks gestation, during second stage of labor, and the first 3 days after delivery. ;

C、Pregnancy is contraindicated in congenital atrial septal defect.;

D、Heart disease is the first leading cause of maternal death in China.