In this case the answer B is correct; Iron.
Metalworkers in ancient India were renowned for their skills in creating different types of objects that were of very pure quality and the highest standards. These of course were not that common and not just anyone could obtain or afford such items.
To grow larger and more powerful. They didn't have to pay people to work so they were able to keep to money and continue to buy more land and grow.
The only true fascist I believe was Benito Mussolini. From home there were a bunch of spin offs