Final answer:
The most appropriate feedback from the nurse would be to check if the suppository is inserted far enough. The correct option is B.
Step-by-step explanation:
The caregiver's technique for administering a rectal suppository is correct in terms of positioning the client, inserting the suppository, and waiting for 10 minutes before repositioning the client. However, it is important to ensure that the suppository is inserted far enough to be effective. By checking to see if the suppository is in far enough, the nurse can provide guidance and make sure that the technique is being performed correctly.
Overall, the caregiver's technique is done correctly, but it is important to verify the placement of the suppository for optimal effectiveness. Hence, B is the correct option.