Final answer:
Blood transfusions are carefully screened for diseases to ensure safety.
Step-by-step explanation:
The best response to the patient would be option 1) Blood transfusions are carefully screened for diseases to ensure safety. When units of blood are being considered for transfusion, pretransfusion blood testing must be performed to confirm that the blood is safe. Commercially prepared antibodies are used to confirm the blood type of both the donor and the recipient, ensuring compatibility and reducing the risk of disease transmission. It is important for the patient to understand that blood transfusions are performed with safety measures in place.