The number of Anganwadi workers supervised by a Mukhyasevika is:

**Core Concept**
The Anganwadi system is a part of the Integrated Child Development Services (ICDS) program in India, aiming to provide nutritional and health services to children, pregnant women, and lactating mothers. The Anganwadi workers are the frontline workers who implement this program, and their supervision is crucial for effective service delivery.

**Why the Correct Answer is Right**
A Mukhyasevika is a supervisor who oversees a group of Anganwadi workers. The Mukhyasevika is responsible for guiding and supporting the Anganwadi workers in their daily tasks, ensuring that the ICDS program is implemented as per the guidelines. Typically, a Mukhyasevika supervises 20 Anganwadi workers, who are spread across various villages or areas. This supervision helps in maintaining the quality of services provided to the beneficiaries.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect as the number of Anganwadi workers supervised by a Mukhyasevika can vary, but 20 is a commonly accepted ratio.
**Option B:** This is incorrect as there is no standard ratio of Anganwadi workers to Auxiliary Nurse Midwives (ANMs) in the ICDS program.
**Option C:** This is incorrect as it is not a commonly accepted ratio of Anganwadi workers to a Mukhyasevika.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the ICDS program has a hierarchical structure, with Anganwadi workers at the grassroots level, supervised by Mukhyasevika, and then by Block Development Officers (BDOs). This hierarchical structure helps in effective implementation and monitoring of the program.

**Correct Answer: D. 20**