Final answer:
The statement made by the patient that indicates successful teaching is option b: "I can help control my blood pressure by avoiding foods high in salt."
Step-by-step explanation:
The statement made by the patient that indicates successful teaching is option b: "I can help control my blood pressure by avoiding foods high in salt." This statement shows that the patient understands the importance of managing blood pressure to prevent diabetic nephropathy. High blood pressure is a risk factor for the development and progression of kidney damage in individuals with diabetes. By avoiding foods high in salt, the patient can reduce their blood pressure and minimize the risk of diabetic nephropathy.