**Core Concept:** Integrated Child Development Services (ICDS) is a government scheme in India that aims to improve the overall development of children under six years of age, including nutrition.

**Why the Correct Answer is Right:**
The correct answer is "C", which refers to "Anganwadi Workers" as the key component of the ICDS scheme. Anganwadi Workers are trained and deployed at community-level to provide primary health care services, including nutrition, to children and pregnant and lactating women. They play a crucial role in identifying and addressing the nutritional needs of undernourished children under six years old.

**Why Each Wrong Option is Incorrect:**
A) "Anganwadi Centre" is the physical location where services are provided, but it does not represent the key personnel involved in delivering care to undernourished children.
B) "Integrated Child Development Services" is the overall scheme, not the specific component responsible for identifying and addressing undernourishment in children.
D) "Nutrition and Health Education" is a component of ICDS but does not represent the main personnel involved in caring for undernourished children.

**Why Option C is Right:**
The correct answer "C" refers to "Anganwadi Workers", who are trained individuals responsible for identifying and addressing the nutritional needs of undernourished children under six years old through the ICDS scheme. They play a crucial role in providing primary health care services, including nutrition, to children and pregnant and lactating women.

**Clinical Pearl:**
The ICDS scheme through Anganwadi Workers serves as a significant initiative in India to combat malnutrition in children under six years old. This highlights the importance of community-based care programs in improving public health outcomes, particularly in addressing nutritional deficiencies in vulnerable populations.