C. Can produce fertile offspring
The species may be widespread so they do not share the same population, territory or resources. However, if they are the same species, they can produce fertile offspring.
Explanation:
An autoimmune disorder occurs when the body sees it's own cells as foreign antigens and begins to attack them.
The treatment depends on the particular autoimmune disorder; however, the mainstay of treatment is the use of IMMUNOSUPPRESSIVE MEDICATION. Examples include corticosteroids (such as prednisone) and nonsteroid drugs such as azathioprine, cyclophosphamide, mycophenolate, sirolimus, or tacrolimus.
I need the picture in order to help you. Let me know if you need help adding the picture to the question.