Apolis of ancient greece was a
a politically independent unit that included a city and surrounding land
b colony controlled by the country that established it
c fortified acropolis or hilltop in the center of a city
d alliance of two or more cities formed for military protection

A polis of ancient Greece was a A) politically independent unit that included a city and surrounding land. A polis was a name given for a city-state which was a political unit that dominated in the time of ancient Greek. 

The second option is correct according to edgenuity

In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy. this would grow to become normandy under rollo's descendants. - wikepedia