Final answer:
A client with Ménière's disease should avoid salty foods as part of their dietary management to help reduce symptoms such as vertigo and hearing loss.
Step-by-step explanation:
The client diagnosed with Ménière's disease demonstrates an understanding of the dietary instructions when they indicate they will avoid D. Salty foods in their diet. Ménière's disease is a condition that affects the inner ear, leading to episodes of vertigo, hearing loss, and tinnitus. A key management strategy is to limit dietary sodium intake because excess salt can cause fluid retention, which can worsen the symptoms of Ménière's disease. Therefore, the correct answer is D. Salty foods.