What is the result of a deficiency of factor IX?

A. ITP is an autoimmune disorder in which the body destroys platelets, leading to increased bleeding, but it is not related to clotting factor deficiencies. B. Christmas disease is another name for hemophilia B, which is caused by a deficiency of clotting factor IX. It results in prolonged bleeding, easy bruising, and hemarthroses (bleeding into joints). C. Thalassemia is a genetic disorder of hemoglobin synthesis, leading to anemia. It does not involve clotting factors. D. Hemophilia A is due to a deficiency of factor VIII, not factor IX. Both A and B result in bleeding tendencies, but the specific factor deficiency distinguishes them.