Explanation:

- The term "Mritapas" refers to a specific category in the traditional Indian caste context.

- They were historically considered as Avarnas, which means "outside" or "without varna" in the four-fold Varna system.

- Brahmins, Kshatriyas, and Shudras are part of the four-fold Varna system (Brahmins - priests, Kshatriyas - warriors, Shudras - manual laborers).

- Avarnas were those communities or individuals who were not included within the main four varnas, and often faced social exclusion.

Correct Answer: Option 3 - Avarnas