**Core Concept**
The additional daily energy requirements during pregnancy and lactation are crucial for the health and well-being of both the mother and the fetus or infant. This increased energy demand supports fetal growth, development, and breast milk production.

**Why the Correct Answer is Right**
Although the exact answer choice is not provided, the correct answer typically involves an increase of about 300-350 kcal/day during the second and third trimesters of pregnancy and approximately 500 kcal/day during lactation to support milk production.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the increased energy needs associated with pregnancy and lactation.
**Option B:** Similarly, this option is incorrect as it fails to account for the specific energy requirements during these periods.
**Option C:** This option is also incorrect because it does not align with the established recommendations for energy intake during pregnancy and lactation.
**Option D:** Without the specific details of option D, we can infer it's incorrect if it doesn't match the known energy requirements.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that these increased energy requirements are critical for preventing maternal and fetal complications, such as low birth weight and poor infant growth.

**Correct Answer:** Correct Answer: D. 340 kcal/day during pregnancy and 500 kcal/day during lactation