C is correct i believe. its not A because that could not be a sentance byitself, not b because im sure you know why and d might be but then the teacher would be trying to explain to you something other then the rules of punctuation
Answer:
The state of Qin initially had the advantage of location and skill in horsemanship. It was said to have been founded by one Gao Yang (also given as Zhuanxu) one of the legendary, predynastic Five Emperors said to have ruled c. 2852-2070 BCE, whose descendants, the Ying family, lived in the region.
