One reason the roman empire was difficult to conquer was because a) the geographic features that surrounded it. eliminate b) there were no people who considered rome an enemy. c) there was not an economic reason to want to conquer it. d) the lack of slavery there made it welcoming for all peoples.

Your answer will be A. The mountains that surround Rome make it easy to spot intruders. Hope this helps

A) the geographic features that surrounded it.

Explanation:

Despite the enormous dimension Roman Empire reach in the 1st century AD (which by itself is big trouble), the capital - Rome - was protected by mountains (the Apennines), among other natural features like an instable terrain that support the protection of the capital.

b) race riots in several cities