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 people living in the region were no longer exclusively hunter-gatherers.
What this question is testing
Conclusion
These bovines were domesticated, and the locals had graduated from the hunter-gatherer lifestyle.
Evidence
Ancient arid Africa. Bovine bones. People around, but zero other large mammals. Any natural water source would have been a large-mammal magnet. So no water means no wild large mammals — but somehow bovines were still there.
Evaluate
The detective work here is clever: no other large mammals means no natural water, yet bovines were present. Someone must have been keeping those bovines alive — and it was not the rain. But this logic only holds if bovines are the type of animal that would normally need natural water to survive. If bovines could just tough it out in the desert on their own, their presence proves nothing about domestication. The argument is quietly assuming bovines are not some sort of camel-like exception to the large-mammal water rule.
Goal
Find the answer that plugs this gap: bovines cannot make it without water in the wild, so humans must have been providing it.
Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.