which is one treatment that is recommended for people with sickle cell disease?\npacemaker implant\ncalcium…

Brief Explanations:

Sickle - cell disease is a genetic blood disorder. A bone - marrow transplant can replace the abnormal blood - forming cells with healthy ones. A pacemaker is for heart rhythm problems, calcium supplements are mainly for bone health, and while a healthy diet and exercise are good for general health, they are not the main treatment for sickle - cell disease.

Answer:

C. bone marrow transplant