A Patient Is Prescribed Topical Hydrocortisone 0

A patient is prescribed topical hydrocortisone 0.1% for skin inflammation.What action is most important to teach the patient for applying this drug?

A) "Use a thick layer of drug just to the area that needs treatment."
B) "Apply a thin layer to the affected area and to the skin near the area."
C) "Apply a thick layer over and 1 inch around the affected area."
D) "Use as thin a layer as possible just to the area that needs treatment."