Fossil evidence shows that early humans were able to walk upright and use bipedalism. which of the following pieces of evidence supports that claim? a. an increase in skull size b. backbone being attached at the base of the skull c. a longer pelvis d. backbone attached forward towards the skull

The correct answer is option B.

Explanation:

Early humans have their spine connected with the skull at the base, stabilizing and holding the head when walking upright whereas in the chimpanzee the spine or the backbone connects with the skull backward that holds skull at an angle.

In the modern humans the backbone is present below the skull and that stabilizing and holding head uptight firmly. This piece of evidence supports that early humans were also able to walk upright.

Thus, the correct answer is option B.