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**Hint:-**Termed as the routine metabolic rate (RMR), the average rate of tissue oxidation of carbohydrate, protein, fat, and other dietary components in the body is basically the amount of energy needed by a person on rest.

**Complete answer:**

Measure of energy requirements for organisms cannot be specifically defined because it varies for every organism and even for every individual. The energy for each person should ideally suffice their body’s requirement for processes like maintaining body size, composition, growth, and physical and mental activities. Factors such as age, gender, body weight, and external stimuli largely influence the energy requirements. For example, a pregnant woman would require additional energy to support the growth of the fetus and cope with the changes in maternal metabolism. If energy intake is consistently above or below a person's need, a change in body energy stores will occur. If the imbalance between intake and expenditure of energy continues over long periods, changes in body weight will occur and may adversely affect the health of the person.

Measurement of the energy requirements/recommendations are generally given in joules (J) or kilocalories (kcal), expressed as energy units required per day, and as the energy required per kg of the body weight. Methods used to measure energy require direct calorimetry (for calculating metabolic rate), doubly labeled water (for average daily metabolic rate or total Carbon dioxide production), and indirect calorimetry (for inspired & expired volumes of gas and concentrations of oxygen and Carbon dioxide).

**Thus, the right option is D.**

**Note:-**Although no specific value of energy requirement can be given, an average value can be recommended which ranges from 2500 to 2800kcal for an average person.

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