Why Was Rome's Geography Perfect for Territorial Expansion

Why was Rome's geography perfect for territorial expansion?

A) Rome's winters featured prolonged cold periods that killed the mosquitos that spread malaria.
B) Rome's location at the edge of the Atlantic Ocean meant that it could expand easily into northern and western Europe.
C) Located far from the active seismic zones in the Mediterranean, Rome was free of natural disasters.
D) Rome possessed a river, fertile farmland, and a port on the Mediterranean.