On the back of your skull you can feel a small bump,below which is an opening where the spinal cord enters the skull.The location of this opening toward the bottom of the skull is significant in evolutionary biology for what reason?

A)It allowed for the hominin brain to grow much larger than other primates.
B)It provided greater protection for the spinal cord.
C)It occurred as a result of the change to a bipedal stance.
D)This change was necessary for the increase in size from prosimian forms to anthropoid forms.