Why Does the Body Reject Transplanted Organs and Not Manufactured

Why does the body reject transplanted organs and not manufactured parts?

A) Manufactured parts are made specifically for an individual so that they won't be rejected.
B) Most manufactured parts are made from products that would not create antigens to cause a rejection.
C) Manufactured parts do not have any blood flow to them so there is less chance of them causing rejection.
D) The body rejects manufactured parts just as equally as it rejects transplanted organs.