Final answer:
The most appropriate way for the nurse to assess the patient's knowledge of nutritional therapy in diabetes is by asking the patient to keep a food diary and review it together.
Step-by-step explanation:
The most appropriate way for the educator to assess the patient's knowledge of nutritional therapy in diabetes would be Option B) Ask the patient to keep a food diary and review it with the nurse. By asking the patient to keep a food diary, the nurse can gain insight into the patient's eating habits, portion sizes, and overall nutritional intake. This information is crucial for assessing the patient's knowledge of nutritional therapy in diabetes.