A nurse is reinforcing teaching to the family of a client who has Parkinson's disease. Which of the following instructions should the nurse include?

A. Clients with Parkinson's disease often have difficulty swallowing, so small, frequent meals are safer and more manageable than three large meals. B. A cane or other assistive devices can help promote mobility and prevent falls, which are common due to shuffling gait and poor balance. C. Parkinson's disease may impair speech or make the voice softer, but hearing is not typically affected, so speaking loudly is not necessary unless the client has a hearing deficit. D. Physical activity should not be limited; in fact, encouraging regular activity helps maintain mobility and flexibility.