An increasing number of lymphomas are being treated with "stem-cell transplantation" therapy that is composed of the following overall steps. Sort these steps into the correct order. Your answer would be a three-letter string composed of letters A to C only, e.g. BAC.
(A) Injection of cells into the blood
(B) Harvesting and isolating selected cells from the patient's bone marrow
(C) Heavy x-ray irradiation of the patient