Explanation:

- Avarnas: This term refers to those outside the four traditional varnas (social classes) in the Indian caste system. The "A" means "without," and "varna" means "color" or "class," indicating those who do not belong to any class.

- Panchamas: Often referred to as the "fifth varna," these individuals are outside the four varnas and are historically considered untouchables.

- Antyajas: This term means "last born" or "least in rank," and historically, these people were also considered untouchables.

- Option 1, 2, and 3 includes all three terms that describe untouchables and is correct based on the given context.