**Core Concept**
The recommended daily energy intake for adults varies based on factors such as age, sex, weight, height, and activity level. For adult women, the energy requirement is higher for those with heavy work or physical activity due to increased energy expenditure. This is essential for maintaining optimal body weight, supporting physical performance, and preventing related health issues.

**Why the Correct Answer is Right**
The basal metabolic rate (BMR) of an adult woman is typically lower than that of a man, but the energy expenditure increases with physical activity. For women with heavy work, the recommended daily energy intake is approximately 2,200-2,400 kcal, which is higher than the standard recommended daily intake for adult women. This increased energy requirement is necessary to support the energy demands of heavy physical activity and maintain optimal health.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is too low for an adult woman with heavy work, as it does not account for the increased energy expenditure associated with physical activity.
**Option B:** This option is also too low and may lead to inadequate nutrition and related health issues, such as fatigue and decreased physical performance.
**Option C:** Although this option is closer to the correct answer, it may still be too low for an adult woman with heavy work, and the actual recommended daily energy intake may vary based on individual factors.

**Clinical Pearl / High-Yield Fact**
When calculating the recommended daily energy intake, it is essential to consider the individual's activity level, as well as other factors such as age, sex, and weight. A commonly used formula to estimate energy requirements is the Harris-Benedict equation, which takes into account BMR and activity level to provide an estimate of daily energy needs.

**Correct Answer: D**. 2,200-2,400 kcal.