Which observation supports the inference that humans and chimpanzees share a common ancestor?

Question

Which observation supports the inference that humans and chimpanzees share a common ancestor?

Chimpanzees and humans have nearly identical DNA.
Chimpanzees and humans live in the same time period.
Chimpanzees and humans eat fruit, meat, and vegetation.
Chimpanzees and humans have five-toed feet and backbones.

Answer 1

The observation that supports the inference that humans and chimpanzees share a common ancestor is that chimpanzees and humans have nearly identical DNA.