Consuls;)) that should be correct!
a); and c). During Chandragupta II reign, great impulse was given to arts and science. One of the main scholars of the time was Aryabhata, who came up with the concept of zero and discovered the ratio of pi. He also worked in demonstrating that the earth moves around the sun instead of otherwise.
The group that was brought in were African slaves. Mostly from West Africa due to an easier commute.
So many settlers moved here because of the soil, it was really rich for farming and could support lots of cattle on the land. Many farmers settled here.
