Final answer:
The client should leave the Lindane cream on for 8 to 12 hours and then remove it by washing.
Step-by-step explanation:
The correct answer is D) Leave the cream on for 8 to 12 hours and then remove by washing. Lindane is an insecticide medication used to treat scabies. It works by killing the mites that cause the infestation. To effectively treat scabies with Lindane, the client should apply the cream and leave it on for 8 to 12 hours before removing it by washing. This allows enough time for the medication to kill the mites and achieve the desired therapeutic effect.