Final answer:
Successful weight maintainers monitor energy nutrient proportions and exercise regularly.
Step-by-step explanation:
Successful weight maintainers have various strategies to keep their weight stable. One important factor is regular exercise, as mentioned in option (d). Another strategy is to monitor the energy nutrient proportions rather than the overall food energy of the diet, as mentioned in option (b). This means paying attention to the balance of macronutrients such as carbohydrates, proteins, and fats. While all the options may have some validity, these two options are supported by research and commonly practiced by successful weight maintainers.
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