The Romans were descended from a cluster of peoples who had crossed the Alps into Italy during the second millenium B.C. and spoke a variety of Indo-European dialects. Recent archaeological research has pushed the origins of the city of Rome back to at least the tenth century B.C., several centuries earlier than the traditional date 753 B.C., which the Romans themselves considered their citys foundation year. Romes strategic location along the Tiber River brought it many different advantages. Trading ships could navigate the Tiber as far as Rome, but no farther; the city could thus serve as a port without being threatened by attack from the sea. Romes famous hills increased the defensibility of the site. In other words, as a city, Rome was situated at a junction across the Tiber, making it a major land and river crossroads.
It is stated in the passage that archaeological evidence obtained so far ----.
A) indicates the tenth century B.C. as the date of the foundation of Rome
B) clearly proves how and when various Indo- European peoples crossed the Alps into Italy
C) shows why the earlier Romans decided to found their city at a site up the Tiber River
D) proves conclusively how Rome came to be a major port for trading ships
E) answers the question of why the original natives of Italy collaborated with the Indo-European invaders