D is the answer for this question as it is the most likely.
India and China claim few slaves with a lion's share of their populace as the low class that did likewise fill in as the slaves. The Indians and Chinese were not noticeable in bondage as the Greco-Romans since they had their kin taking the necessary steps that the slaves did. The Chinese and Indians one might say had slaves it was quite recently that the slave was called something different and held a higher economic wellbeing than simple slaves.
In his text "Slavery, a System of Inherent Cruelty," Theodore D. Weld shows how cattle were sometimes treated better than slaves. An example he gives of this is how cattle are allowed to graze as much as they want, while slaves often received a very small portion of food. Another example he gives is how when cattle are to be sold, they are transported in a way that is comfortable to them. On the other hand, slaves often had to walk very long distances, regardless of the weather, while being chained to each other.
Lasting roughly 2.5 million years, the Stone Age ended around 5,000 years ago when humans in the Near East began working with metal and making tools and weapons from bronze. During the Stone Age, humans shared the planet with a number of now-extinct hominin relatives, including Neanderthals and Denisovans