"That which might be the first clear representation of a horse in the Middle East can be found in a tablet form Ur III, reign of Šu-Sin, 2037 – 2029 BCE . . . Therefore, it is possible to place domestic horses in Ur prior to 2000 BCE. Since horse domestication took place in the steppes of northern Kazakhstan, a link between this region and the Middle East must be found, in order to account for the horses' presence there. Only after c. 2100 BCE did horses begin to appear regularly in the Near and Middle east. This means that sometime between c.2500 and c.2100 BCE, there was an increase in the influx of horses into the region." From The Origin and the Spread of the War Chariot by Elias Manuel Morgado Pinheiro (2010).
The author's argument could best be understood in the context of which of the following historical developments?
Choose 1
Choose 1

(Choice A)
A
There was an exchange of technology and methods of transportation between the steppes and Mesopotamia.

(Choice B)
B
There was an exchange of technology and methods of transportation between the Mongol Empire and the steppes.

(Choice C)
C
Mesopotamian military expeditions spread their civilization and city-states into the Eurasian steppes

(Choice D)
D
The independent development of new technologies within Mesopotamian society spread to the steppes