I think it is c. That one makes the most sense to me.
While others civilizations were devoting huge amounts of time and resources to the rich, ... The ruins of two ancient cities, Harappa and Mohenjo-Daro (both in ... Similar seals with different animal symbols and writings have since been found throughout the region. ... This copy of the Rig Veda was written after the Vedic Age.
The major campaign issue in the 1928 Election was, Religion and Prohibition.
Sooo I believe your answer is b.
Conventions are meeting that delegates have one famous convention is the constitutional convention. And if your talking about the fun conventions like the science ones or beauty conventions those are like party anyone is invited to