**Core Concept**
The Integrated Child Development Services (ICDS) is a government program in India that provides supplementary nutrition, healthcare, and education to children, pregnant women, and lactating mothers. The program aims to improve the health and nutritional status of vulnerable groups, including pregnant women.

**Why the Correct Answer is Right**
The caloric supplement for pregnant women under ICDS is designed to meet their increased energy requirements during pregnancy. Pregnant women require an additional 340-360 calories per day, which is crucial for the growth and development of the fetus. The supplement is typically provided in the form of food grains, such as wheat, rice, or millets, which are rich in calories and essential nutrients.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the ICDS program or the caloric requirements of pregnant women.
**Option B:** This option is incorrect as it does not specify the correct caloric supplement provided under ICDS.
**Option C:** This option is also incorrect as it does not provide a clear or accurate answer regarding the caloric supplement.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the caloric supplement provided under ICDS is tailored to meet the specific nutritional needs of pregnant women, which is crucial for their health and the health of their unborn child.

**Correct Answer:** B. 100 calories.