The Roman Peace on the Borders Was Rarely Disrupted During

The Roman Peace on the borders was rarely disrupted during the first two centuries following Augustus, but problems did occur:

A) Primarily on the northern border, where the kingdom of Meroë was in the ascendancy.
B) Primarily on the eastern border, where it was adjacent to Parthia.
C) Mainly along the southern border, where Arabian nomads were pressing.
D) Largely on the western border, where Viking ships were making raids on the British Isles and Iberian Peninsula.