Which fact most clearly shows the difficulty in defending the Roman empire against invasion?

A.
At its height, the empire likely had a population as high as 100 million.

B.
At its height, the empire comprised nearly 1.7 million square miles of land and water.

C.
Over the course of its history, the Roman empire built about 55,000 miles of paved roads.

D.
The Mediterranean Sea stretches about 2,300 miles west to east and about 600 miles from Italy to the African coast.

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the answer is B
Yes, the answer is B. The vast size of the empire made it difficult to defend against invasion from all sides.