The best source of historical evidence to describe how an events unfolded would be a first person source, or a website ending in .edu
A demand schedule generally focuses on overall demand of a product or service. That is, in units or monetary value. This could be over time, yearly, quarterly, or semianually.
Answer; C
Explanation: he Vedas are a collection of hymns and other ancient religious texts written in India between about 1500 and 1000 BCE.