Which Action by a New RN Who Is Caring for a Patient

Which action by a new RN who is caring for a patient with an intraaortic balloon catheter inserted in the left femoral artery will require immediate intervention by the ICU charge nurse?

A) The new RN checks the patient's pedal pulses every 30 minutes.
B) The new RN elevates the head of the patient's bed to 90 degrees.
C) The new RN turns the patient onto the left side.
D) The new RN has the patient take deep breaths.