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.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."