Final answer:
The Etruscans worshipped a version of the Greek god Helios by the name of Sol. This reflects the broader Roman tendency to incorporate and adapt gods from different cultures into their pantheon.
Step-by-step explanation:
The Etruscans worshipped a version of Helios by the name of Sol. This aligns with the Roman adaptation of Greek gods, wherein the Roman pantheon often assimilated gods from different cultures, adapting their names and attributes.
The worship of solar deities was common across ancient civilizations, but specifically, the Romans and Etruscans recognized the sun deity under the name Sol. The adoption of solar gods like Sol Invictus during the Severan dynasty further showcases the importance of solar deities in Roman culture.
Considering the extent to which solar worship permeated Roman religious practices, it's not surprising that the Etruscans also had a sun god, which they identified with the Greek god Helios. Therefore, option a) Sol, is correct for the name the Etruscans used for their version of Helios.