PLS HELP the map shows the Italian Peninsula.

A map titled Italian Peninsula. A key shows Mountains in teal, Plains in green, Hills in yellow. The Italian Alps are along the northern border of Italy. The Apennine Mountains run down the center of Italy. The Tiber River is on the west side of the Apennine Mountains, going through Rome. Sardina is west of Italy. Sicily is southwest of the bottom tip of Italy. The Mediterranean Sea is south of Sardinia and west of Sicily. The Adriatic Sea is east of Italy.

What geographic feature on the map helped Rome trade with surrounding areas?

the Adriatic Sea
the Mediterranean Sea
the Apennine Mountains
the Italian Alps