Final answer:
The statement that indicates a good understanding of the discharge instructions is option b. "I will avoid sources of strong electromagnetic fields."
Step-by-step explanation:
The statement that indicates a good understanding of the discharge instructions for a client with an implantable cardioverter-defibrillator (ICD) is option b. "I will avoid sources of strong electromagnetic fields." This statement shows that the client understands that strong electromagnetic fields can interfere with the functioning of the ICD. It is important for the client to stay away from strong electromagnetic fields, such as those produced by MRI machines, as they can affect the performance of the ICD.