An 82-year-old client is newly diagnosed with Alzheimer disease. The client's adult child asks the nurse how the medication is going to help. What should the nurse explain in layman's terms?

a. "The drugs work by increasing acetylcholine (ACh) levels in the brain and slowing the progression of the disease."
b. "The drugs work by crossing the blood-brain barrier and cure the disease in the brain."
c. "The drugs work by increasing ACh levels in the brain and reverse the progression of the disease."
d. "The drugs work by crossing the blood-brain barrier and decreasing ACh levels in the neuromuscular junctions."