Final answer:
The island famous for the worship of Helios and the 'Colossus' statue is Rhodes. The associated ritual involved driving a quadriga off a cliff into the sea.
Step-by-step explanation:
The island that was a major worship center for Helios and was home to the statue known as the "Colossus" is Rhodes. This island not only featured a massive statue dedicated to the sun god Helios, but it also had rituals associated with his worship, such as driving a quadriga, a four-horse chariot, off a cliff into the sea. The correct answer to the question provided is c) Rhodes.