Final answer:
The fossil record suggests that bipedality evolved before large brain size in hominins. Early hominins like Australopithecus were bipedal, and larger brains emerged later with species such as Homo erectus.
Step-by-step explanation:
The correct answer to the question is B:
Bipedality evolved before large brain size. This is suggested by the fossil record, which illustrates early hominins possessing anatomical features geared toward bipedalism well before the development of larger brain sizes that characterize more recent hominins.
According to fossil evidence, earlier hominins such as Australopithecus already demonstrated bipedal movement - a significant indication that bipedality was an early adaptation in human evolution. It wasn't until species like Homo erectus that we see substantial increases in brain size, indicating that a large brain was a later development. Furthermore, the number of hominin species coexisting at any point in time suggests a complex and branching tree of human evolution rather than a single, linear progression.
While the fossil record also suggests that different hominin species, including at least four, may have coexisted at the same time, this point (C) is not as clearly supported as the bipedality proposition in the record of human evolution. Similarly, the transition from more wooded to open savanna habitats (A) is evident but not as straightforwardly documented as the advent of bipedal locomotion.