GENERAL KNOWLEDGE

Detailed explanation-1: -The varnas have been known since a hymn in the Rigveda (the oldest surviving Indian text) that portrays the Brahman (priest), the Kshatriya (noble), the Vaishya (commoner), and the Shudra (servant) issued forth at creation from the mouth, arms, thighs, and feet of the primeval person (purusha).

Detailed explanation-2: -Reason(R): The 8th Mandala of Rig Veda mentions about the varna system.

Detailed explanation-3: -The Rig Veda (10:90) says that the gods created it by sacrificing the primal Purusha. His mouth became the Brahmin, his arms, Kshatriyas, his thighs, Vaishyas, and his feet became Shudras. And outside the pale of the varna system were the Untouchables, or Dalits.