Final answer:
The ct statement indicating an understanding of teaching is to focus on a balanced diet and regular exercise (B).
Step-by-step explanation:
The nurse should identify that the ct statement indicating an understanding of teaching is b) "I'll focus on a balanced diet and regular exercise." This statement demonstrates an understanding that sustainable weight loss involves a combination of healthy eating habits and physical activity. Skipping meals (a) is not a recommended approach as it can negatively impact health and metabolism. Eating only high-fat foods (c) is also not advisable as it can lead to weight gain and other health issues. Crash diets (d) are not effective for long-term weight loss and can be harmful to the body.