July 4, 1777 which is was independence day
The application of scientific knowledge for practical purposes, especially in industry.
I would say justice and democracy.
The Gupta empire was made up of
Brahims a.k.a the priests
Vaishyas a.k.a merchants and tradesman
Shudras a.k.a Peasants
Kshatriyas a.k.a warrior and rulers
The fourth choice satisfies this list.
