Final answer:
The ancient territory of Italy on the Tyrrhenian Sea that lent its name to a classical language is Etruria. The Etruscans greatly influenced Roman art and culture and ruled Rome before it became an empire.
Step-by-step explanation:
The ancient territory of Italy on the Tyrrhenian Sea that lent its name to a classical language is Etruria (option a).
Etruria, located in central Italy between the Arno and Tiber rivers, is now known as Tuscany. The Etruscans, the former inhabitants of Etruria, greatly influenced Roman art and culture. They even ruled Rome before it became a major empire.
The Greeks referred to the Etruscans as Tyrrhenoi. The Etruscans had their own distinctive language that has not been fully deciphered yet.