Monica Has Been Trying to Lose Weight for About a Year

Monica has been trying to lose weight for about a year. Throughout the past year, she has educated herself on the guidelines of good nutrition and exercise. Despite knowing that she needs to change her lifestyle, she is frustrated with her inability to lose weight and wants to quickly start losing weight. She is trying to lose 5 to 10 pounds as soon as possible because she feels that gradual changes are disappointing, and she is unable to commit to a gradual change. As a result, she ends up overeating and does not exercise. For her most recent diet, she decides to try a popular low-calorie weight-loss approach and adhere to the following program: day 1: fruits only, day 2: vegetables only, day 3: fruits and vegetables only, day 4: six bananas and milk, days 5 and 6: tomatoes only, and day 7: eat whatever you want. In addition to the diet, Monica exercises once per day for a short period of time if she has time.
Which feature of Monica's diet plan will likely prevent her from being able to sustain her diet?

A) The diet is not a commercially marketed weight-loss program.
B) The diet does not include enough protein and has too many carbohydrates.
C) The diet is overly restrictive and would be too unpleasant over the long term.
D) The diet is too low in fat.
E) The diet is not coupled with weight-loss herbal supplements.