Question

choose the word or phrase that best completes each sentence.
caesar augustus made sure that the central government controlled tax collection
engineers built the field of mars, which had government offices and statues.
a was created to improve communication.
c dered the construction of, which improved water
cr chariot express
mail service
large wagon

Explanation:

To improve communication in the Roman Empire, a mail service (also known as the "Cursus Publicus") was established. "Chariot express" and "large wagon" are not accurate terms for this communication - improving system, while "mail service" fits the context of enhancing communication.

Answer:

A. mail service