Anthropologists who favored a chimpanzee model for early human society justified their position on the grounds that

a) Human beings and chimpanzees are closely related hominoids

b) The first hominids and modern chimpanzees would have had to adapt to ecologically varied habitats

c) Chimpanzees use tools and share food with relatives and mates

All the options

Explanation:

Anthropologists who favored a chimpanzee model for early human society justified their position on the grounds that Human beings and chimpanzees are closely related hominoids, The first hominids and modern chimpanzees would have had to adapt to ecologically varied habitats and that Chimpanzees use tools and share food with relatives and mates