Final answer:
The pelvis is the best indicator of the skeletal differences between males and females, with the female pelvis being wider to facilitate childbirth and the male pelvis being heavier and stronger to support a greater body mass.
Step-by-step explanation:
The differences in the skeletons of males and females can best be seen in the characteristics of the B) pelvis. The adult female pelvis is adapted for childbirth and is, therefore, wider than that of a male. This is reflected in several specific features: the bones of the male pelvis are thicker and heavier due to their adaptation for support of the male's heavier build and stronger muscles. The female pelvis has a broader greater sciatic notch, the distance between the anterior superior iliac spines is wider, the ischial tuberosities are farther apart, which increases the size of the pelvic outlet, and the subpubic angle is larger, usually greater than 80 degrees, compared with less than 70 degrees in males. The female sacrum is also wider, shorter, and less curved, and the pelvic cavity more rounded to facilitate childbirth. These anatomical differences make the pelvis the best indicator for determining the sex of a skeleton.