<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 2-year-old girl is brought to the physician by her mother for a well-child examination. Cardiac auscultation is shown. When she clenches her fist forcefully for a sustained time, the intensity of the murmur increases. Which of the following is the most likely cause of this patients auscultation findings?? A: Prolapse of the mitral valve, B: Fusion of the right and left coronary leaflets, C: Defect in the atrial septum, D: Defect in the ventricular septum, E: Failure of the ductus arteriosus to close,  <response>: This is a question about a heart murmur in a 2-year-old girl that increases in intensity when she clenches her fist. The description indicates that this is likely a ventricular septal defect VSD. A VSD is an opening between the left and right ventricles of the heart. When the child clenches her fist, it increases blood flow across the defect and increases the intensity of the murmur. Choice D Defect in the ventricular septum matches this diagnosis. The other choices describe other types of congenital heart defects that would not have this characteristic murmur.D: Defect in the ventricular septum 