What are the famous hill and river that Rome was settled by?

According to legend, the city of Rome was founded in 753 BC on the banks of the Tiber about 25 kilometres (16 mi) from the sea at Ostia. Tiber Island, in the center/middle? of the river between the two Trastevere and the ancient city center. Which was the site of an main important thing ancient ford and was later on abridged span cross over.

i don't think it's c or d. i think it's either a or b.

hope this .