Creo que la dinastía porque llevó a la formación de la 1ra dinastía en Egipto junto con una floreciente ciudad de Memphis.
I am going to go ahead and say that your answer is C because regions can end for many reasons and most of which I'm certain of which are affected by the physical characteristics of the region.
I hope that this helps. :)
The second answer is correct (B).
The entrance of the USA in the first world war occurred in April of 1917, when the United States declared war against the Germans and their allies. A large volume of soldiers, tanks, ships and warplanes were used to ensure that the Entente victory was secured. In a short time, the German and Austrian troops were defeated. In November 1918, the armistice of Compiègne hit the retreat of the Germans and the rapid victory of the Triple Entente.
It heleped by saving time and time is money because it shorted the distance of traveling
Probably to either to team up for a common goal or to oversee the trades in their area.