**Core Concept**
During pregnancy, a woman's energy requirements increase due to the growth and development of the fetus, placenta, and uterine expansion. This energy expenditure is essential for fetal growth and maternal health.

**Why the Correct Answer is Right**
The recommended daily energy intake during pregnancy varies based on factors like pre-pregnancy weight, age, and activity level. The World Health Organization (WHO) recommends an additional 340 kcal/day for women with a normal body mass index (BMI) during the second and third trimesters. This increase in energy expenditure is mainly due to the energy required for fetal growth, which is estimated to be around 80-100 kcal/day in the first trimester, increasing to around 340 kcal/day in the second and third trimesters.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is too low, as the recommended daily energy intake during pregnancy is significantly higher due to the increased energy expenditure.

**Option B:**
This option is incorrect, as the recommended daily energy intake during pregnancy is not significantly higher than the pre-pregnancy energy requirements.

**Option C:**
This option is too high, as the recommended daily energy intake during pregnancy is not excessively higher than the pre-pregnancy energy requirements.

**Clinical Pearl / High-Yield Fact**
A woman's energy requirements during pregnancy increase by approximately 340 kcal/day in the second and third trimesters, which is essential for fetal growth and maternal health. This energy expenditure is crucial for the development of a healthy fetus and should be taken into account when planning a woman's diet during pregnancy.

**Correct Answer: A. 340 kcal/day**