Final answer:
Rome had fewer natural barriers to invasion due to its less rugged landscape compared to Greece. Hence the correct answer is option B
Step-by-step explanation:
The result of Rome having a less rugged landscape than Greece was that Rome had fewer natural barriers to invasion. Unlike Greece, which was protected by mountains and difficult terrain, Rome had a more accessible and open landscape, making it easier for invasions to occur. This lack of natural barriers made Rome more vulnerable to attacks from outside forces.
Hence the correct answer is option B