The correct option is C The island of Delos
The island of Delos in the eastern Mediterranean was made a free port in 166 BC and became one of the main market venues for slaves. Multitudes of slaves who found their way to Italy were purchased by wealthy landowners in need of large numbers of slaves to labor on their estates. Hence, Option A is correct. Among the rest of the options, the French Emperor Napoleon was exiled to Elba, Stromboli is a volcanic island which was often deserted, and Ponza has the ancient basins built in the 1st century BC by the Romans for breeding moray eels. Hence, these are incorrect.