What was the main reason for the creation of provincial capitals in the Mauryan empire?

Complete the following sentences:

(a) Officials collected __________from the area under the direct control of the ruler.

(b) Royal princes often went to the provinces as __________.

(c) The Mauryan rulers tried to control ____________and ___________which were important for transport.

(d) People in forested regions provided the Mauryan officials with _____________.