Final answer:
Option D). Chris is utilizing Orem's Theory by assisting Mr. Moats with activities he would normally do for himself, to aid his recovery from a stroke.
Step-by-step explanation:
In his nursing care, Chris is putting D. Orem's Theory to use. The premise of Orem's Self-Care Deficit Nursing Theory is that nursing care ought to be focused on assisting patients in carrying out tasks that, given the opportunity, they would ordinarily complete on their own. The idea behind this theory is that patients can heal more quickly if they participate in their regular self-care routines to the best of their abilities after a sickness or injury—like in Mr. Moats' case, a stroke—than if they don't.