Answer:
Probably to have better ability to travel one place to another.
Answer: Letter E. We do not want to mess up something sacred to ones culture.
Answer:
The Institute for Government is an independent charity working to increase government effectiveness. We work with all the main political parties and with senior civil servants.
Since you provide no options,
The most significant result probably that Kiev was able to increase its wealth
After Kiev increased its trade around that region , they're able to buy more manpower and equipments that would help them in their cause