What Is the Best Description of the Upanishads

Multiple Choice

What is the best description of the Upanishads?

A) The Upanishads were poetic musings about the Aryan history.
B) The Upanishads were philosophical musings and speculations about life.
C) The Upanishads were historic chronicles of the development of Aryan civilization.
D) The Upanishads were a series of poems dealing with the three main Hindu gods.
E) The Upanishads were part of the Mahabharata , the world's longest poem.