Final answer:
The home health aide should not cut the toenails of a diabetic client.
Step-by-step explanation:
In giving foot care to a diabetic client, the home health aide should not cut the toenails (option B). Diabetic clients have a higher risk of developing foot problems, and it is important not to cut their toenails to avoid injuries. Cleaning under the toenails (option A), soaking the feet for more than 5 minutes in a basin of warm water (option C), and putting lotion on the feet after drying them (option D) are all important steps in foot care for a diabetic client.