The best choice for older adults with small energy allowances is to select nutrient-dense foods. Thus, the correct option is B.
The foods required to eat for older adults include Fat-free or low-fat milk and cheese, fruits and vegetables, beans, nuts, seeds., etc.
Nutrient-dense foods are required for older adults because these foods assist them in the maintenance of body posture, strength, and energy for work, and allow them in keeping fit and active throughout the day.
Thus, the correct option is B.
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