The correct answer is B. A paved road system.
Step-by-step explanation
During the Roman Empire trade was one of the main economic activities, this initially meant a challenge. However, this was a reason to build a stone-paved road system to connect all the empire from the year 312 B. C, this allowed Romans to transport products floats, and animals faster. Also, this was to send military reinforcement to much of the Empire quickly in cases of being needed. According to the above, the answer is B. A paved road system.