A 55-year-old African American male presents for episodes of breathlessness, coughing, and rapid breathing that have gotten progressively worse over the last month. A chest X-ray shows a  remarkably...

A 55-year-old African American male presents for episodes of breathlessness, coughing, and rapid breathing that have gotten progressively worse over the last month. A chest X-ray shows a  remarkably enlarged heart while his ECHO reveals a normal ejection fraction but decreased  cardiac output. What is the cause of his symptoms?

A. Left-heart failure

B. Right-heart failure

C. Diastolic failure

D. Uncompensated heart failure