A 35-year-old patient comes for evaluation of progressive shortness of breath on exertion and fatigue for the past 1 year. On physical examination, she has pedal edema, jugular venous distention, and hepatomegaly. Pathological finding in the second heart sound is detected in this patient with an increased intensity of second heart sound (P2 louder than A2 in the pulmonic region). A mutation in a gene encoding for bone morphogenetic receptor 2 (BMPR2) is reported by the genetics lab.

Which of the following is the most likely diagnosis?