While Helping a Student Nurse Apply a Nitroglycerine Patch to the Patient's

While helping a student nurse apply a nitroglycerine patch to the patient's skin, the nursing instructor would appropriately intervene if

A) The student nurse removed a patch that was applied yesterday before applying the new patch.
B) The student nurse removed her gloves before placing the patch.
C) The student nurse wrote the date, time, and her initials on the patch before applying it to the patient's skin.
D) The student nurse placed the new patch on the patient's right shoulder because the last patch was on the left shoulder.