Answer: I think C is not the answer. A and D as well, therefore B should be the answer.
Explanation: Because when you say Hunter-Gather the interesting facts about them is the diet consisted of a variety of grasses, tubers, fruits, seeds, and nuts from their earliest days. Because they lacked the equipment to kill larger animals, they had to get their meat from smaller game or by scavenging.
For B they are still weak community. People maintain a three-tiered social network in both communities. The first is their immediate family, which typically consists of five or six people, the second is a group of three to four closely related households, who frequently share food, and the third is the larger camp. And it is too small population in my opinion.