Which geologic era marked the rise of human civilization? A. Paleozoic B. Mesozoic C. Cenozoic D. Nectarian

The answer would be : C. Cezonic

The cezonic era began around 65 million years ago which often referred as "the age of mammals". It's the era when the mammals started to top the food chain on top of the land (in this Era, most of the Large Reptiles're already gone)