Final answer:
To help reduce agitation in a client with Alzheimer's disease, it is best to approach them in a slow, unhurried manner. Loud noises or physical interventions without consent can worsen agitation, and isolation in a dark room can increase stress. The correct option is A.
Step-by-step explanation:
When dealing with a client who has Alzheimer's disease and is experiencing agitation, the best measure to take is A. Approach the client in a slow, unhurried manner.
It is important to maintain a calm environment to help reduce the client's agitation. Sudden movements or a busy environment can increase confusion and anxiety. Approaching the client calmly and speaking in a gentle, reassuring tone can help to alleviate stress.
Turning the volume of the TV up, as suggested in option B, is likely to worsen agitation because loud noises can be overwhelming and contribute to sensory overload.
Similarly, option C, massaging the client's back, might be inappropriate without the client's clear consent or if the client is not comfortable with such physical contact.
Lastly, option D, placing the client in a darkened room and shutting the door, could significantly increase anxiety and distress. A better approach would be creating a quiet, peaceful environment where the client does not feel isolated or confined.