Tests reveal that Mrs. Rogers's mitral valve does NOT close properly, allowing a backflow of blood with each heart contraction. The medical word to describe this valve problem is .

Tests reveal that Mrs. Rogers's mitral valve does NOT close properly, allowing a back-flow of blood with each heart contraction. The medical word to describe this valve problem is mitral valve regurgutation. it is caused due to the non-closure of mitral valve  in proper tight manner which leads to the back flow of blood continuously with every contraction.

Explanation:

It is a pathological (medical) condition when the heart's mitral valve doesn't close properly (tightly), allowing the blood to flow backward in the heart.

if you listed your answers right then i believe your answer is b.