Choice A rationale:

Advising the client to perform high-impact aerobic exercises is not appropriate for someone with osteoarthritis, especially if they complain of stiffness.

High-impact exercises can place excessive stress on the affected joints and worsen symptoms.

Choice B rationale:

Recommending ice packs to the affected joint regularly may temporarily reduce inflammation and provide relief, but it does not address the issue of stiffness or promote joint flexibility.

Choice C rationale:

Encouraging the client to keep the joint immobile to prevent further stiffness is not the best approach.

Immobilization can lead to joint contractures and loss of range of motion.

It's important to promote gentle movement and flexibility exercises to manage stiffness in osteoarthritis.

Choice D rationale:

Instructing the client on gentle range-of-motion exercises is the most appropriate education to address stiffness in osteoarthritis.

These exercises can help maintain joint flexibility, reduce stiffness, and improve overall joint function.