Here's a small list of popular books that can help and introduce you to Ancient India. They are all available in English, by the way.
1- "A History of India, vol. 1: From Origins to 1300" (Romila Thapar)
2- "Ancient India as Described in Classical Literature; Being a Collection of Greek and Latin Texts Relating to India, Extracted from Herodotus and Other" (John Watson McCrindle)
3- "The Philosophy of Ancient India" (Richard von Garbe)
4- "Ancient India: in Historical Outline" (D.N. Jha)
5- "The Ancient Geography Of India" (Alexander Cunningham)
British Blockades made it difficult for the US to trade with the central powers.
Hope I helped.
Answer:
For the economic development of the nation.
The caste system in ancient India was used to establish separate classes of inhabitants based upon their social positions and employment functions in the community.
Both a and b. so tje answer would be d
