Answer:
I believe the answer is:
E.) They built a vast network of roads, bridges, and tunnels
B.) They imposed their language and religion on conquered peoples.
Step-by-step explanation:
It would be answer E due to the purpose of this is to establish a route that the Incas can use to build a relationship with other nations, either for economic or diplomatic purposes
It would be answer B because by doing this, they are planning to spread their culture and influence their conquests, and make absorbed them into a part of their population. (which would increase their military reserve)