I might be wrong, but I believe that it's D.) Delaware.
Sorry if it was incorrect.
If a can remember it was answer D
The correct answer is Indus Valley.
The community of the Indus River Valley Civilization earned many eminent advances in technology, including great accuracy in their systems and tools for measuring length and mass, boats and watercraft, carts, and other wheeled transport.
To boost their morale and give them a reason to continue fighting