Acomparision between the spine of a human and that of a great ape shows that a human spine
a. has three distinct curves - two backward and one forward - for balance
b. should have two distinct curves to keep the weight centered above the pelvis
c. is "c" shaped as a result of one backward curve in order to keep the trunk over the legs
d. is straight in order to facilitate upright posture

B

Explanation:

The spine of a human is S shaped as opposed to that of a chimpanzee, that is C shaped. In humans, this shape allows for the weight of the chest to rest upon the pelvis. Conversely, the C shaped spine of apes allows for the weight to be forward which is better for four-legged locomotion.

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