The correct options are
A Maya
C Karma
D Mukti
The Upanishads were composed around the 6th century BCE. They are the foundation on which Indian philosophy stands. They put forth various explanations about life while trying to explore the relationship between the soul and the creator of life. In this endeavour, they propound the theories of Karma (Action), Maya (Illusion), and Mukti (Salvation). All these knowledge of the Upanishads were treated as many different books.