A Patient Has Been in the Physical Therapy Department for the Past

A patient has been in the physical therapy department for the past 20 minutes and has received electrical stimulation to the upper trapezius bilaterally while lying prone on a treatment table. There were hot packs placed on top of the electrodes, and the patient felt a mild but comfortable tingling sensation during the application of the electrical stimulation. After removing the electrodes and hot packs, the area has a mild hyperemia. How should this be explained to the patient?

A) "This is a normal response."
B) "This is a normal response, which is an increase in circulation that should last for approximately an hour or possibly longer."
C) "Your neck is red, and it will go away soon."
D) You don't need to explain it to a patient; he or she can't see his or her own neck.