Answer:
(A) The author thinks the building of the canal was impressive that the people who designed it deserve more credit for the impact it has on the communication and transportation of China.
(B)The author explains the impact of the canal allowing people to make A trade-in between two very far parts of the country, Beijing, and Hangzhou.
(C) The canal was a driving force of expansion by opening communication and was a consequence of imperial expansion in the sense that everything needed to be faster