The answer is B. Made peace with the Hittites.
I believe the answer is B. The states had too much power and the government was too weak, therefore they abolished it so the central government could have more power.
The caste system is one ancient Hindu belief that still affects modern-day India. Although, it is no longer enforced in modern-day India but the idea of it is still thrown around. I hope I helped in some way, you should look into it a little more so you can have reasons how and why it make still be thrown out there, and how it is still present in modern-day India.
B) The heir to the Austrian throne was assassinated
