Use the drop-down menu to complete the sentence. the upanishads were written by

The Upanishads were written by people in India, probably between c 800 BCE and c 500 BCE.

Upanishads are a collection of religious and philosophical nature texts. It seems to be that some people wanted to change the focus of religious from external rites to something much more spiritual.

This books contain the ideas of important spiritual figures in India.

this doesn't support enough information to answer the question.

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska