Hello, Sorry for answering late... I'm busy.
This should be B or A. I rather go with A..
The Port of Savannah.
The Port of Savannah, at the mouth of the Savannah River, has shown a year-to-year growth rate in shipping volume of over 11%, higher than ports in New York and New Jersey as well as South Carolina and Texas. (In the early 2000s, the growth rate of the Port of Savannah was even higher, at over 16%)
It's hard to define a decisive turning point in Greek history as there were many.
However, one that really might stand out apart from the rest was their wars with the Persians. They were successful in their defence against a Persian invasion, an invasion of an empire that was drastically bigger than the combined Greek lands.