The Inca had advanced knowledge of engineering. What did the Inca build to keep their empire connected?

A.

a carriage pulled by horses

B.

a network of telegraph wires

C.

a collection of colorful pottery

D.

a system of roads and bridges

To keep their empire connected since they had advanced knowledge of engineering, the Inca built;

D. A system of roads and bridges

The system of roads an bridges provided the movement of armies, people, and goods and also providing an important physical symbol of imperial control.