Question ID:PT90 S2 Q3 Passage:Bovine remains found in a certain region of Africa date back to a time when the climate was arid. While there were people in the region at this time, there were no other large mammals there. Any natural sources of water available to these bovines would have brought other large mammals to the area. Thus, these bovines had been domesticated and the people living in the region were no longer exclusively hunter-gatherers. Stem:Which one of the following is an assumption on which the argument depends? Correct Answer Choice:AChoice A:Unless they are domesticated, bovines are unlikely to exist in a region where there are no natural sources of water available to them. Choice B:Domesticating animals is one of the first practices that a society must adopt in order to change from hunting and gathering to agriculture. Choice C:With the help of humans, other large mammals would have been able to inhabit this arid region. Choice D:No human culture obtains food both through agriculture and through hunting and gathering. Choice E:Domesticated animals of a given size do not need as much water as do wild animals of comparable size.