Hominins are committed to bipedalism and cannot locomote efficiently in any other way, in other words
a. obligate bipeds
b. a generalized adaptation
c. the hominin foot is the only part of the body structured for this purpose
d. similar to most members of the order primates

a. obligate bipeds

Explanation:

Obligate bipedalism is a characteristic feature of hominins. These organisms are adapted to walk on two legs instead of four limbs. It is a mode of locomotion that involves activities like walking, running, jogging and others seen in humans and their primitive ancestors, only few animals practice bipedalism as their usual means of locomotion.

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