The correct answer is d. hunting -gathering.
Hunting and gathering was already existing before this : in fact the neolithic revolution was going away from this lifestyle and starting farming and domestication of animals.
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1. "If I sacrifice 3 oxen, will it be sunny tomorrow?"
2. "If I sacrifice 100 boats, will I get ____ "
3. "If I sacrifice 10 men, will I win the war of ___? "