**Core Concept**
The Integrated Child Development Services (ICDS) scheme is a government program aimed at improving the nutritional status of children under six years of age. The scheme provides a package of services, including supplementary nutrition, to support the growth and development of these children.

**Why the Correct Answer is Right**
The correct supplement provided under the ICDS scheme for a two-year-old child is a mixture of rice, wheat, and other essential nutrients. This supplement is designed to meet the nutritional needs of the child, particularly during the critical growth phase from two to six years of age. The supplement is typically given in the form of a meal, which includes a combination of calories, proteins, and essential micronutrients.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify the correct nutritional supplement provided under the ICDS scheme.
**Option B:** This option is incorrect as it is not a known nutritional supplement provided under the ICDS scheme.
**Option C:** This option is incorrect as it is not the correct nutritional supplement provided under the ICDS scheme.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the nutritional supplement provided under the ICDS scheme is tailored to meet the specific needs of children in different age groups. The supplement is designed to support the growth and development of children, particularly during critical periods of development.

**Correct Answer:** C. Ration of 500 calories and 12-15 grams of protein.