I suggest you to go with first one a. there was heavy damage only within a mile of the bomb's impact. There're no closer description than that.
The quote indicates a Roman expansion of land. during the rule of Augustus
Explanation:
During the prosperous reign of the king Augustus, the empire of Rome stretched along the lines that the quote has given thus it is a passage about the stretch of land that was under Roman control at that time.
The tone of the passage conveys that it is not just a survey of the land under Roman rule but a boast of the might of the Roman empires and its vast stretch from mythical rivers to far away lands as being described here.
More versions of the same product will be out on the market, some may fail, leaving two or three different brands behind.
