Final answer:
The client statement that indicates that nursing teaching has been effective is "Setting up a monthly medication management system will be helpful."
Step-by-step explanation:
A) "Setting up a monthly medication management system will be helpful."
This statement indicates that the nursing teaching has been effective. This client understands the importance of properly managing their medications and recognizes that having a system in place will be beneficial for them. By setting up a monthly medication management system, the client can keep track of their medications and ensure they are taking them correctly and consistently.